Accounts payable - trade Accounts receivable, net of allowance for doubtful accounts of $258 Accrued liabilities Accumulated other comprehensive income Additional paid-in capital Non-cash charges to earnings, net Accounts receivable, allowance for doubtful accounts Amendment Flag Total assets Total assets ASSETS: Total current assets Total current assets Current assets: Capital lease obligations Capital lease obligation- noncurrent Cash and cash equivalents Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Net increase (decrease) in cash and cash equivalents Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Before Adjustment Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes Cash Paid During Period For [Abstract] Cash paid during the period for: Cash Surrender Value Of Life Insurance And Cash Held In Trust Cash surrender value of life insurance and cash held in trust Commitments and contingencies Common stock, par value Common stock, issued Common stock - $1.00 par value, issued 9,163,940 shares COMPREHENSIVE INCOME Cost of revenues Disclosure related to costs in excess of billings and billings in excess of costs incurred. Costs In Excess Of Billings And Billings In Excess Of Costs Incurred [Text Block] COSTS AND ESTIMATED EARNINGS IN EXCESS OF BILLINGS, NET Costs in Excess of Billings on Uncompleted Contracts or Programs Expected to be Collected within One Year Costs and estimated earnings in excess of billings, net Current Fiscal Year End Date Deferred compensation Deferred Rent And Other Long Term Liabilities Noncurrent Deferred rent and other liabilities Deferred Tax Assets, Net, Current Deferred income taxes Deferred Tax Assets, Net, Noncurrent Deferred income taxes RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS Document - Document and Entity Information [Abstract] Document - Document and Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Year Focus Document Information [Line Items] Document Period End Date Document Type Net income per common share: Earnings Per Share, Basic Basic Earnings Per Share, Diluted Diluted EARNINGS PER SHARE Effect of exchange rate changes on cash and cash equivalents Entities [Table] Entity Central Index Key Entity Common Stock, Shares Outstanding Entity [Domain] Entity Filer Category Entity Registrant Name FAIR VALUE OF FINANCIAL INSTRUMENTS Sum of the carrying amounts of all goodwill and intangible assets of the balance sheet date, net of accumulated amortization and impairment charges. Goodwill and other intangible assets Gross margin Gross margin Income before provision for income taxes Income before provision for income taxes Equity income Income Statement [Abstract] Income Tax Disclosure [Text Block] INCOME TAXES Income Taxes Paid Income Taxes Provision for income taxes Net changes in operating assets and liabilities Net changes in operating assets and liabilities Interest Expense Interest expense Interest INVENTORIES Inventories, net Investment income Investment in and loans receivable from affiliates Legal Entity [Axis] Total liabilities Total liabilities Total liabilities and stockholders' equity Total liabilities and stockholders' equity LIABILITIES AND STOCKHOLDERS' EQUITY: Total current liabilities Total current liabilities Current liabilities: Marketable securities Net cash used in financing activities Net cash used in financing activities Cash flows from financing activities: Net cash used in investing activities Net cash used in investing activities Cash flows from investing activities: Net cash provided by operating activities Net cash provided by operating activities Cash flows from operating activities: Net income Net income Other income (expense): Notes to Financial Statements [Abstract] Notes to Financial Statements [Abstract] Operating profit Operating profit CONSOLIDATED FINANCIAL STATEMENTS Other assets Other income (expense), net Purchase of marketable securities Purchase of marketable securities Purchase of fixed assets Purchase of fixed assets Preferred stock, par value Preferred stock - $1.00 par value Prepaid income taxes, expenses and other Proceeds on redemption of marketable securities Proceeds from exercise of stock options Property, plant and equipment, at cost, less accumulated depreciation and amortization RELATED PARTY TRANSACTIONS Payment of lease obligations Payment of lease obligations Research and development expense Retained earnings Net revenues SEGMENT INFORMATION Selling and administrative expenses Statement [Line Items] Statement of Cash Flows [Abstract] Statement of Financial Position [Abstract] Statement [Table] Total stockholders' equity Total stockholders' equity Stockholders' equity: Stockholders' Equity before Treasury Stock Stockholders' Equity before Treasury Stock, Total Supplemental disclosures of cash flow information: Trading Symbol Common stock reacquired and held in treasury, shares TREASURY STOCK TRANSACTIONS Common stock reacquired and held in treasury - at cost (853,033 shares at July 31, 2011 and 865,734 shares at April 30, 2011) Common stock reacquired and held in treasury - at cost (853,033 shares at July 31, 2011 and 865,734 shares at April 30, 2011) Weighted Average Number of Shares Outstanding, Diluted Diluted Average shares outstanding: Weighted Average Number of Shares Outstanding, Basic Basic