Document and Entity Information [Abstract] Document And Entity Information [Abstract] Statement [Table] Legal Entity [Axis] Entity [Domain] Parent Company [Member] Statement [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Period Focus Document Fiscal Year Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Statement of Financial Position [Abstract] Statement, Scenario [Axis] Scenario, Unspecified [Domain] ASSETS: Cash and Cash Equivalents Cash and Cash Equivalents at End of Period Cash and Cash Equivalents at Beginning of Period Cash and Cash Equivalents, at Carrying Value, Total Restricted Cash Receivables, net Receivables, Net, Current, Total Inventories Inventories, net Inventory, Net, Total Deferred Tax Assets Net Current Deferred Tax Assets, Net, Current, Ending Balance Deferred Tax Assets, Net, Current, Beginning Balance Deferred Income Taxes, net Deferred Tax Assets, Net, Current, Total Other Current Assets Other Current Assets Total Current Assets Total Current Assets Property and Equipment, net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Total Intangible Assets, net Intangible Assets, Net (Excluding Goodwill), Total Deferred Income Taxes, net Deferred Tax Assets, Net, Noncurrent, Total Other Assets Other Long-Term Assets Other Assets Assets Total Assets Liabilities And Stockholders Equity Abstract LIABILITIES AND SHAREHOLDERS' EQUITY: Notes Payable Notes Payable (Note 7) Notes Payable, Current, Total Current Portion of Long-Term Obligations Long-term Debt, Current Maturities, Total Accounts Payable, Current, Total Accounts Payable Accounts Payable, Current, Total Accrued Payroll and Related Liabilities Employee-related Liabilities, Current, Total Taxes Payable and Other Accrued Taxes Taxes Payable, Current, Total Deferred Tax Liabilities Current Deferred Income Taxes The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income. Plus, the refundable consideration, usually cash, held by the entity pending satisfactory completion of the entity's obligations or pending the closing of a contract. Deferred Revenue and Customer Deposits Other Accrued Liabilities Other Accrued Liabilities Total Current Liabilities Total Current Liabilities Long-Term Obligations, net Long-term Debt, Excluding Current Maturities, Total Deferred Tax Liabilities Non current Deferred Income Taxes Subordinated Notes (Note 6) Other Long-Term Liabilities Other Long-Term Liabilities Liabilities Total Liabilities Commitments and Contingencies (Note 8) Shareholders' Equity: Series A 8% Convertible Preferred Stock - $.01 par value, 1,000 shares authorized, none issued Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Total Common Stock - $.01 par value, 84,000 shares authorized, 47,150 and 46,927 shares issued and outstanding at July 31, 2010 and April 30, 2010, respectively Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Additional Paid In Capital Additional Paid in Capital, Ending Balance Additional Paid in Capital, Beginning Balance Capital in Excess of Par Additional Paid in Capital, Total Retained Earnings Accumulated Defici Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Accumulated Deficit Retained Earnings (Accumulated Deficit), Total Stockholders' Equity Attributable to Parent Accumulated Other Comprehensive Income (Loss): Defined Benefit Plan Obligation, net of income tax of $42 and $37 Defined Benefit Plan Obligation, net of income tax Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Net of Tax, Beginning Balance Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Net of Tax, Total Cumulative Translation Adjustment, net of income tax Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Beginning Balance Cumulative Translation Adjustment, net of income tax of $715 and $508 Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balances, Balances, Total Shareholders' Equity Liabilities and Stockholders' Equity Total Liabilities and Shareholders' Equity Scenario, Actual [Member] Par value of Preferred Stock Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued, Total Par Value of Common Stock Common Stock, Shares Authorized Common Stock, Shares Issued Common Stock, Shares, Issued, Total Common Stock, Shares Outstanding Balances, Shares, Balances, Shares, Income Statement [Abstract] Sales Sales Revenue, Net, Total Cost of Sales Cost of Sales Gross Margin Gross Margin Operating Expenses: Sales and Marketing Sales and Marketing Research and Engineering Research and Development Expense, Total General And Administrative Expense General and Administrative General and Administrative Expense, Total Restructuring and Other Operating Charges Restructuring and Other Operating Charges, net Operating Expenses Total Operating Expenses Operating Income (Loss) Operating Income (Loss) Investment Income Interest Interest Income Interest Expense Interest Expense Interest Expense Other Expense, net Other Income, net Other Income (Expense), net Income (Loss) Before Provision for Income Taxes Income (Loss) Before Benefit (Provision) Income Taxes Income Tax Expense (Benefit) Benefit (Provision) for Income Taxes (Provision) Benefit for Income Taxes (Provision) Benefit for Income Taxes Income (Loss) from Continuing Operations Loss from Continuing Operations Loss from Discontinued Operations, net of income tax of $0 and $0 Indemnification Charge Indemnification Charge Income (Loss) from Discontinued Operations, net of Income Tax of $0, $9, $0, and $46 Profit Loss Net Loss Net Loss Basic and Diluted Loss Per Share: Loss from Continuing Operations (Basic and Diluted) Loss from Continuing Operations Discontinued Operations (Basic and Diluted) Discontinued Operations Net Loss (Basic and Diluted) Net Loss Weighted Average Shares Used in Computing Basic and Diluted Loss Per Share: Weighted Average Number of Shares (Basic and Diluted) Basic and Diluted Statement of Operations Parenthetical Disclosure Statement of Operations Parenthetical Disclosures [Abstract] Income Tax effect on Loss from Discontinued Operations Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation, Total Statement of Cash Flows [Abstract] Cash Flows from Operating Activities: Adjustments to Reconcile Net Loss to Cash Provided by Operating Activities: Depreciation and Amortization Depreciation, Depletion and Amortization, Total Deferred Income Taxes Deferred Income Tax Expense (Benefit), Total Provision for Slow Moving and Obsolete Inventory Bad Debt Expense Warranty Expense Incentive Stock Compensation Expense Share-based Compensation, Total Unrealized Foreign Exchange Currency (Gains) Losses Unrealized Foreign Exchange Currency (Gains) Write-off and Amortization of Deferred Debt Issuance Costs Charge against earnings in the period associated with unsuccessful business acquisition. Charge against earnings in the period associated with unsuccessful business acquisition OMAX Termination Charge Accretion Expense Interest Accretion on Subordinated Notes Other Increase Decrease In Operating Capital Abstract Changes in Operating Assets and Liabilities: Receivables Increase (Decrease) in Receivables, Total Increase Decrease In Inventories Inventories Increase (Decrease) in Inventories, Total Other Operating Assets Accounts Payable Accounts Payable Increase (Decrease) in Accounts Payable, Total Increase (Decrease) in Employee Related Liabilities Accrued Payroll and Payroll Related Liabilities Accrued Payroll and Related Liabilites Increase (Decrease) in Employee Related Liabilities, Total The net change during the reporting period, excluding the portion taken into income, in the liability reflecting services yet to be performed by the reporting entity for which cash or other forms of consideration was received or recorded as a receivable. Plus the net change during the period in the amount of customer money held in customer accounts, including security deposits, collateral for a current or future transactions, initial payment of the cost of acquisition or for the right to enter into a contract or agreement. Increase Decrease in deferred Revenue and Customer Deposits Deferred Revenue and Customer Deposits Deferred Revenue and Customer Deposits Payments held in escrow for unsuccessful business combination including legal, accounting, and other costs that were charged to expense during the period, but would have been capitalized had the contemplated transaction been completed Release of Funds from Escrow Release of Funds from Escrow "Net change during the reporting period in the amount related to the settlement of litigation Payment for Patent Litigation Settlement Net change during the reporting period in the amount related to merger and acquisition costs. Payment For Acquisition Termination Payment for OMAX Termination Other Operating Liabilities Other Operating Liabilities Other Operating Liabilities Other Operating Liabilities Net Cash Provided by (Used in) Operating Activities Cash Provided by Operating Activities Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] Cash Flows From Investing Activities: Expenditures for Property and Equipment Expenditures for Property and Equipment Payments to Acquire Property, Plant, and Equipment, Total Expenditures for Intangible Assets Expenditures for Intangible Assets Proceeds from Sale of Property and Equipment Proceeds from Sale of Property, Plant, and Equipment, Total Increase (Decrease) in Restricted Cash Restricted Cash Restricted Cash Restricted Cash Net Cash Provided by (Used in) Investing Activities Cash (Used in) Investing Activities Cash Flows from Financing Activities: Borrowings under Senior Credit Agreement Proceeds from Lines of Credit, Total Repayments under Senior Credit Agreement Repayments under Senior Credit Agreement Repayments of Other Debt Repayments Under Other Financing Arrangements Repayments of Long-Term Obligations Repayments of Long-Term Obligations Payments of Debt Issuance Costs Payments for Debt Issuance Costs Debt Issuance Costs Debt Issuance Costs Net Cash Provided by (Used in) Financing Activities Cash (Used in) Financing Activities Effect of Changes in Exchange Rates Effect of Exchange Rate on Cash and Cash Equivalents, Total Decrease in Cash And Cash Equivalents Increase (Decrease) in Cash And Cash Equivalents Supplemental Disclosures of Cash Flow Information: Interest Taxes Income Taxes Supplemental Disclosures of Noncash Investing and Financing Activities: Accounts Payable incurred to acquire Property and Equipment, and Intangible Assets Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Parent [Member] Capital In Excess of Par Accumulated Deficit Accumulated Other Comprehensive Loss Class of Stock [Axis] Class of Stock [Domain] Components of Comprehensive Income Components of Comprehensive Income [Abstract] Components of Comprehensive Loss: Adjustment to Minimum Pension Liability, Net of Income Tax of $$ Adjustment to Minimum Pension Liability, Net of Income Tax of $5 Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax Cumulative Translation Adjustment, Net of Income Tax Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Total Comprehensive Loss Total Comprehensive Loss Stock Compensation, Value Stock Compensation, Shares Statement of Stockholders' Equity Parenthetical Disclosures Statement of Stockholders' Equity Parenthetical Disclosures [Abstract] OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTax Income tax on Cumulative Translation Adjustment Other Comprehensive Income, Foreign Currency Translation Adjustment, Tax, Total OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentTax Income tax on Adjustment to Minimum Pension Liability Basis of Presentation [Abstract] Basis of Presentation [Abstract] Basis of Presentation Recently Issued Accounting Pronouncements Recently Issued Accounting Pronouncements [Abstract] Recently Issued Accounting Pronouncements Receivables, Net Receivables, Net [Abstract] Schedule Of Accounts Notes Loans And Financing Receivable Text Block Receivables, Net Inventories Inventories [Abstract] Inventory Disclosure Text Block Inventories Restructuring Activities and Other Restructuring Activities and Other Schedule of Restructuring and Related Costs [Text Block] Restructuring Activities and Other Termination of OMAX Merger Agreement [Abstract] Termination of OMAX Merger Agreement [Abstract] Termination of Acquisition Agreement [Text Block] Termination Of Acquisition Agreement Text Block Termination of OMAX Merger Agreement Long-Term Obligations and Notes Payable Long-Term Obligations and Notes Payable [Abstract] Long-Term Obligations and Notes Payable Commitments and Contingencies Commitments and Contingencies [Abstract] Commitments and Contingencies Stock-based Compensation Stock-based Compensation [Abstract] Stock-based Compensation Basic and Diluted Income (Loss) per Share Basic and Diluted Income (Loss) per Share [Abstract] Basic and Diluted Loss per Share Other Income (Expense), Net Other Income (Expense), Net [Abstract] Disclosure of those nonoperating income or nonoperating expense that may include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. Other income (Expense) Nonoperating [Text Block] Other Income (Expense), Net Income Taxes Income Taxes [Abstract] Income Taxes Segment Information Segment Information [Abstract] Segment Information Common Stock