Intangibles and Goodwill - Intangible Assets Summary (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jul. 31, 2017
Intangible assets with finite lives:
Gross	$ 201,959	$ 172,703
Accumulated Amortization	(72,118)	(55,739)
Net	129,841	116,964
Intangible assets with indefinite lives:
Trademarks and tradenames	7,520	7,548
Total intangible assets
Gross	209,479	180,251
Accumulated Amortization	(72,118)	(55,739)
Net	137,361	124,512
Customer relationships
Intangible assets with finite lives:
Gross	133,347	119,576
Accumulated Amortization	(45,618)	(34,773)
Net	87,729	84,803
Total intangible assets
Accumulated Amortization	(45,618)	(34,773)
Technology
Intangible assets with finite lives:
Gross	54,585	39,064
Accumulated Amortization	(19,836)	(15,260)
Net	34,749	23,804
Total intangible assets
Accumulated Amortization	(19,836)	(15,260)
Brand names
Intangible assets with finite lives:
Gross	8,141	8,188
Accumulated Amortization	(3,857)	(3,225)
Net	4,284	4,963
Total intangible assets
Accumulated Amortization	(3,857)	(3,225)
Non-compete agreements
Intangible assets with finite lives:
Gross	3,060	3,092
Accumulated Amortization	(1,628)	(1,428)
Net	1,432	1,664
Total intangible assets
Accumulated Amortization	(1,628)	(1,428)
Patents and other registrations
Intangible assets with finite lives:
Gross	2,826	2,783
Accumulated Amortization	(1,179)	(1,053)
Net	1,647	1,730
Total intangible assets
Accumulated Amortization	$ (1,179)	(1,053)
Jet Prep Ltd. | Technology
Intangible assets with finite lives:
Gross		(3,730)
Accumulated Amortization		3,730
Total intangible assets
Accumulated Amortization		$ 3,730