Intangibles and Goodwill - Intangible Assets Summary (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Jul. 31, 2017
Intangible assets with finite lives:
Gross	$ 190,657	$ 172,703
Accumulated Amortization	(59,339)	(55,739)
Net	131,318	116,964
Intangible assets with indefinite lives:
Trademarks and tradenames	7,519	7,548
Total intangible assets
Gross	198,176	180,251
Accumulated Amortization	(59,339)	(55,739)
Net	138,837	124,512
Amortized technology related asset excluded from computation	59,339	55,739
Customer relationships
Intangible assets with finite lives:
Gross	131,810	119,576
Accumulated Amortization	(37,403)	(34,773)
Net	94,407	84,803
Total intangible assets
Accumulated Amortization	(37,403)	(34,773)
Amortized technology related asset excluded from computation	37,403	34,773
Technology
Intangible assets with finite lives:
Gross	44,744	39,064
Accumulated Amortization	(15,931)	(15,260)
Net	28,813	23,804
Total intangible assets
Accumulated Amortization	(15,931)	(15,260)
Amortized technology related asset excluded from computation	15,931	15,260
Brand names
Intangible assets with finite lives:
Gross	8,210	8,188
Accumulated Amortization	(3,426)	(3,225)
Net	4,784	4,963
Total intangible assets
Accumulated Amortization	(3,426)	(3,225)
Amortized technology related asset excluded from computation	3,426	3,225
Non-compete agreements
Intangible assets with finite lives:
Gross	3,092	3,092
Accumulated Amortization	(1,487)	(1,428)
Net	1,605	1,664
Total intangible assets
Accumulated Amortization	(1,487)	(1,428)
Amortized technology related asset excluded from computation	1,487	1,428
Patents and other registrations
Intangible assets with finite lives:
Gross	2,801	2,783
Accumulated Amortization	(1,092)	(1,053)
Net	1,709	1,730
Total intangible assets
Accumulated Amortization	(1,092)	(1,053)
Amortized technology related asset excluded from computation	1,092	$ 1,053
Jet Prep Ltd. | Technology
Intangible assets with finite lives:
Accumulated Amortization	(3,730)
Total intangible assets
Accumulated Amortization	(3,730)
Amortized technology related asset excluded from computation	$ 3,730