Acquisitions Intangibles Contech (Details) (Contech [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended
	Oct. 31, 2013	Aug. 02, 2013	Jul. 31, 2013 Goodwill [Member]	Aug. 02, 2013 Goodwill [Member]	Oct. 31, 2013 Trade Name, Finite Intangible Asset [Member]	Aug. 02, 2013 Trade Name, Finite Intangible Asset [Member]	Oct. 31, 2013 Trademarks [Member]	Aug. 02, 2013 Trademarks [Member]	Oct. 31, 2013 Developed Technology Rights [Member]	Aug. 02, 2013 Developed Technology Rights [Member]
Business Acquisition [Line Items]
Goodwill Deductible for Tax Purposes				$ 1,276
Intangibles Deductible for Tax Purposes		2,898
Intangible assets		$ 2,898				$ 25		$ 166		$ 2,707
Useful Life	15 years		15 years		0 years 3 months		10 years		5 years