Intangibles and Goodwill - Intangible Assets Summary (Details) - USD ($)	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Intangible assets with finite lives:
Amortization expense	$ 13,095,000	$ 13,265,000	$ 10,641,000
Gross	145,210,000	142,539,000
Accumulated Amortization	(41,002,000)	(64,855,000)
Net	104,208,000	77,684,000
Intangible assets with indefinite lives:
Trademarks and tradenames	7,511,000	8,152,000
Total intangible assets
Gross	152,721,000	150,691,000
Accumulated Amortization	(41,002,000)	(64,855,000)
Net	$ 111,719,000	85,836,000
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	12 years
Customer relationships
Intangible assets with finite lives:
Gross	$ 100,649,000	97,697,000
Accumulated Amortization	(24,689,000)	(39,549,000)
Net	75,960,000	58,148,000
Total intangible assets
Accumulated Amortization	(24,689,000)	(39,549,000)
Technology
Intangible assets with finite lives:
Gross	32,767,000	26,508,000
Accumulated Amortization	(11,813,000)	(12,656,000)
Net	20,954,000	13,852,000
Total intangible assets
Accumulated Amortization	(11,813,000)	(12,656,000)
Brand names
Intangible assets with finite lives:
Gross	6,194,000	12,970,000
Accumulated Amortization	(2,394,000)	(10,865,000)
Net	3,800,000	2,105,000
Total intangible assets
Accumulated Amortization	(2,394,000)	(10,865,000)
Non-compete agreements
Intangible assets with finite lives:
Gross	3,092,000	3,129,000
Accumulated Amortization	(1,193,000)	(997,000)
Net	1,899,000	2,132,000
Total intangible assets
Accumulated Amortization	(1,193,000)	(997,000)
Patents and other registrations
Intangible assets with finite lives:
Gross	2,508,000	2,235,000
Accumulated Amortization	(913,000)	(788,000)
Net	1,595,000	1,447,000
Total intangible assets
Accumulated Amortization	$ (913,000)	$ (788,000)