Intangibles and Goodwill - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 20,849	$ 17,357	$ 18,407
Amortization expense, 2020	18,025
Amortization expense, 2021	17,706
Amortization expense, 2022	17,324
Amortization expense, 2023	16,294
Amortization expense, 2024	$ 15,427
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	20 years
Weighted average
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	12 years
Technology | Jet Prep Ltd.
Finite-Lived Intangible Assets [Line Items]
Accelerated amortization			$ 2,401