Intangibles and Goodwill - Intangible Assets Summary (Details) - USD ($)	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Jul. 31, 2016
Intangible assets with finite lives:
Amortization expense	$ 3,909,000	$ 3,094,000
Gross	173,965,000		$ 145,210,000
Accumulated Amortization	(44,514,000)		(41,002,000)
Net	129,451,000		104,208,000
Intangible assets with indefinite lives:
Trademarks and tradenames	7,490,000		7,511,000
Total intangible assets
Gross	181,455,000		152,721,000
Accumulated Amortization	(44,514,000)		(41,002,000)
Net	$ 136,941,000		111,719,000
Minimum
Intangible assets with finite lives:
Estimated useful lives	3 years
Maximum
Intangible assets with finite lives:
Estimated useful lives	20 years
Weighted average
Intangible assets with finite lives:
Estimated useful lives	13 years
Customer relationships
Intangible assets with finite lives:
Gross	$ 112,556,000		100,649,000
Accumulated Amortization	(26,874,000)		(24,689,000)
Net	85,682,000		75,960,000
Total intangible assets
Accumulated Amortization	(26,874,000)		(24,689,000)
Technology
Intangible assets with finite lives:
Gross	46,923,000		32,767,000
Accumulated Amortization	(12,859,000)		(11,813,000)
Net	34,064,000		20,954,000
Total intangible assets
Accumulated Amortization	(12,859,000)		(11,813,000)
Brand names
Intangible assets with finite lives:
Gross	8,760,000		6,194,000
Accumulated Amortization	(2,582,000)		(2,394,000)
Net	6,178,000		3,800,000
Total intangible assets
Accumulated Amortization	(2,582,000)		(2,394,000)
Non-compete agreements
Intangible assets with finite lives:
Gross	3,092,000		3,092,000
Accumulated Amortization	(1,252,000)		(1,193,000)
Net	1,840,000		1,899,000
Total intangible assets
Accumulated Amortization	(1,252,000)		(1,193,000)
Patents and other registrations
Intangible assets with finite lives:
Gross	2,634,000		2,508,000
Accumulated Amortization	(947,000)		(913,000)
Net	1,687,000		1,595,000
Total intangible assets
Accumulated Amortization	$ (947,000)		$ (913,000)