Intangibles and Goodwill (Details) (USD $)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Intangible assets with finite lives:
Amortization expense	$ 10,061,000	$ 9,124,000	$ 5,687,000
Gross	110,755,000	97,532,000
Accumulated Amortization	(44,213,000)	(35,656,000)
Net	66,542,000	61,876,000
Intangible assets with indefinite lives:
Trademarks and trade names	9,387,000	9,435,000
Total intangible assets
Gross	120,142,000	106,967,000
Accumulated Amortization	(44,213,000)	(35,656,000)
Net	75,929,000	71,311,000
Low end of range
Intangible assets with finite lives:
Estimated useful lives	2 years
High end of range
Intangible assets with finite lives:
Estimated useful lives	20 years
Weighted average
Intangible assets with finite lives:
Estimated useful lives	11 years
Customer relationships
Intangible assets with finite lives:
Gross	72,142,000	60,271,000
Accumulated Amortization	(25,379,000)	(20,421,000)
Net	46,763,000	39,850,000
Total intangible assets
Accumulated Amortization	(25,379,000)	(20,421,000)
Technology
Intangible assets with finite lives:
Gross	21,006,000	20,797,000
Accumulated Amortization	(9,642,000)	(7,590,000)
Net	11,364,000	13,207,000
Total intangible assets
Accumulated Amortization	(9,642,000)	(7,590,000)
Brand names
Intangible assets with finite lives:
Gross	12,680,000	11,945,000
Accumulated Amortization	(8,045,000)	(6,778,000)
Net	4,635,000	5,167,000
Total intangible assets
Accumulated Amortization	(8,045,000)	(6,778,000)
Non-compete agreement
Intangible assets with finite lives:
Gross	3,159,000	3,147,000
Accumulated Amortization	(541,000)	(404,000)
Net	2,618,000	2,743,000
Total intangible assets
Accumulated Amortization	(541,000)	(404,000)
Patents and other registrations
Intangible assets with finite lives:
Gross	1,768,000	1,372,000
Accumulated Amortization	(606,000)	(463,000)
Net	1,162,000	909,000
Total intangible assets
Accumulated Amortization	$ (606,000)	$ (463,000)