Restatement of the Unaudited Consolidated Financial Statements (Narrative) (Details) - USD ($)	3 Months Ended
	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Apr. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase (decrease in depreciation and amortization expense	$ (3,762,000)			$ (4,363,000)
Increase (decrease) in Property, Plant and Equipment, Net	(113,374,000)	$ (115,704,000)		(118,429,000)
Increase (decrease) in Intangible Assets, Net	(13,142,000)	(12,956,000)		(17,735,000)
Increase (decrease) in Goodwill	(40,816,000)	(40,672,000)		(52,216,000)
Change in fair value of acquisition-related contingent consideration	63,000			212,000
Increase (decrease) in Accrued liabilities	(12,703,000)	(12,042,000)		(16,735,000)
Increase (decrease) in Other liabilities	(14,439,000)	(15,640,000)		(25,581,000)
Increase (decrease) in Retained Earnings	(230,207,000)	(229,443,000)		(244,055,000)
Increase (decrease) in Inventory	(46,901,000)	(45,839,000)		(58,981,000)
Reduction in income tax expense	(2,434,000)			(2,309,000)
Increase (decrease in Other Assets, Current	(4,889,000)	(4,429,000)		(6,361,000)
Increase (decrease) in Deferred Tax Liabilities, Noncurrent	(2,120,000)	(3,247,000)		(7,278,000)
Increase (decrease) in Liability for Uncertain Tax Positions, Noncurrent	(2,999,000)	(2,999,000)		(3,281,000)
Increase (decrease) in Additional Paid in Capital	$ (53,832,000)	(53,907,000)		(53,275,000)
Debt Instrument, Covenant Compliance	In addition, the Company has requested and received covenant waivers from its lenders related to its credit agreement due to its late filing of financial statement information during fiscal 2017.
Net Cash Provided by (Used in) Financing Activities	$ (10,797,000)			(9,044,000)
Net Cash Provided by (Used in) Investing Activities	(1,435,000)			$ (4,433,000)
Adjustments for Tax Balances [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase (decrease) in Accrued liabilities	54,000
Increase (decrease) in Retained Earnings	2,539,000
Reduction in income tax expense	(449,000)
Increase (decrease in Other Assets, Current	(454,000)
Increase (decrease) in Deferred Tax Liabilities, Noncurrent	(2,082,000)
Increase (decrease) in Liability for Uncertain Tax Positions, Noncurrent	(42,000)
Increase (decrease) in Additional Paid in Capital	(923,000)
Adjustments to cash flows [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Cash Provided by (Used in) Financing Activities	0
Net Cash Provided by (Used in) Investing Activities	$ 0
Vista Research [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Business acquisition contingent consideration payments period	7 years
Vista Research [Member] | Adjustments Related to Long-lived Asset Impairment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Long-lived asset impairment			$ 3,813,000
Increase (decrease in depreciation and amortization expense	$ (424,000)
Increase (decrease) in Property, Plant and Equipment, Net	(393,000)
Increase (decrease) in Intangible Assets, Net	(2,518,000)
Increase (decrease) in Retained Earnings	$ (2,911,000)
Error Corrections and Prior Period Adjustments, Description	In conjunction with the identification of the material weakness in internal controls related to the Company’s accounting for goodwill and long-lived assets, including finite-lived assets, the Company reassessed the impairment analysis of the Vista reporting unit that had been performed during the quarter ended October 31, 2015. Based on that reassessment, the Company concluded that there were errors in certain forecast assumptions and in the determination of the unit of account for long-lived asset impairment testing.
Vista Research [Member] | Adjustment for Goodwill Impairment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase (decrease) in Goodwill	$ (4,084,000)
Increase (decrease) in Retained Earnings	$ (4,084,000)
Error Corrections and Prior Period Adjustments, Description	The Company also determined that the forecast assumption errors resulted in an understatement of the amount of goodwill impairment originally recognized in the quarter ended October 31, 2015 and that the tax-deductible goodwill of the Vista reporting unit should have been fully impaired as of that date. The Company recorded this income statement adjustment in fiscal 2016 and there were no additional income statement adjustments to Vista's goodwill impairment for the quarter ended April 30, 2016.
Vista Research [Member] | Adjustment for Fair Value of Contingent Consideration Liability [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in fair value of acquisition-related contingent consideration	$ (19,000)
Increase (decrease) in Accrued liabilities	90,000
Increase (decrease) in Other liabilities	696,000
Increase (decrease) in Retained Earnings	(786,000)
Vista Research [Member] | Adjustments for Inventories [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Inventory write-down	0	49,000
Increase (decrease) in Inventory	(49,000)	$ (49,000)
Vista Research [Member] | Cost of Sales [Member] | Adjustments Related to Long-lived Asset Impairment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase (decrease in depreciation and amortization expense	(422,000)
Vista Research [Member] | Selling, General and Administrative Expenses [Member] | Adjustments Related to Long-lived Asset Impairment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase (decrease in depreciation and amortization expense	$ (2,000)