Acquisitions Radar Goodwill and Intangibles (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2014	Oct. 31, 2014	Jan. 31, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross			$ 25,710
Radar Industries [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		15 years
Intangibles Deductible for Tax Purposes				$ 5,620
Goodwill [Member] | Radar Industries [Member]
Business Acquisition [Line Items]
Goodwill Deductible for Tax Purposes				$ 31,136
Finite-Lived Intangible Asset, Useful Life	15 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross			17,918
Customer Relationships [Member] | Radar Industries [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		14 years
Finite-Lived Intangible Assets, Gross	$ 3,320	$ 3,320
Developed Technology Rights [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross			$ 5,007
Developed Technology Rights [Member] | Radar Industries [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years
Finite-Lived Intangible Assets, Gross	$ 2,300	$ 2,300