Acquisitions Radar Industries Inc. (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2014	Oct. 31, 2015	Jul. 31, 2015	Oct. 31, 2015	Oct. 29, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	$ 25,710	$ 25,470		$ 25,470
Business Combination, Provisional Information, Initial Accounting Incomplete, Nature of Adjustments				(488)
Radar Industries [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	57,874
Consideration Transferred Net of Cash Acquired						$ 57,799
Business Combinations, Recognized Identifiable Assets Acquired And Liabilities Assumed, Cash In Escrow		2,250		$ 2,250		$ 6,500
Escrow Deposit Disbursements, Funds Returned to Company			$ 1,296
Escrow Deposit Disbursements, Funds Returned to Company As a Reduction to Purchase Price			$ 195
Escrow Deposits Disbursements, Funds Returned to Seller		2,759
Cash and cash equivalents					$ 75
Accounts receivable					14,136
Inventory					13,144
Prepaid assets and other					2,780
Property, plant and equipment					25,922
Goodwill					14,053
Finite-Lived Intangible Assets, Gross					6,380
Accounts payable and other					(18,811)
Business Combination, Consideration Transferred					57,679
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets		2,486
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities		2,685
Business Combination, Provisional Information, Initial Accounting Incomplete, Nature of Adjustments		300
Finite-Lived Intangible Asset, Useful Life				15 years
Business Combinations, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles Deductible for Tax Purposes					6,380
Goodwill [Member] | Radar Industries [Member]
Business Acquisition [Line Items]
Business Combinations,, Recognized Identifiable Assets Acquired And Liabilities Assumed, Goodwill Deductible for Tax Purposes					30,648
Finite-Lived Intangible Asset, Useful Life				15 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	17,918	17,598		$ 17,598
Finite-Lived Intangible Asset, Useful Life				13 years 2 months 14 days
Customer Relationships [Member] | Radar Industries [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross					4,000
Finite-Lived Intangible Asset, Useful Life				14 years
Developed Technology Rights [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	5,007	5,007		$ 5,007
Finite-Lived Intangible Asset, Useful Life				7 years 3 months 1 day
Developed Technology Rights [Member] | Radar Industries [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross					2,300
Finite-Lived Intangible Asset, Useful Life				10 years
Noncompete Agreements [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	$ 744	$ 824		$ 824
Finite-Lived Intangible Asset, Useful Life				2 years 3 months 14 days
Noncompete Agreements [Member] | Radar Industries [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross					$ 80
Finite-Lived Intangible Asset, Useful Life				5 years