Intangible Assets (Details) - USD ($)	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 400,509,000	$ 361,095,000
Accumulated Amortization	138,619,000	120,299,000
Net Carrying Amount	261,890,000	240,796,000
Amortization of intangibles	18,320,000	$ 21,075,000	$ 22,823,000
Estimated Amortization Expense, Fiscal Year Maturity [Abstract]
2020	20,700,000
2021	19,563,000
2022	18,322,000
2023	18,322,000
2024	$ 17,631,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	20 years 6 months	21 years
Gross Carrying Amount	$ 276,834,000	$ 249,831,000
Accumulated Amortization	66,484,000	55,350,000
Net Carrying Amount	$ 210,350,000	$ 194,481,000
Technologies
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	12 years 8 months 12 days	12 years 9 months 15 days
Gross Carrying Amount	$ 92,649,000	$ 82,370,000
Accumulated Amortization	59,522,000	54,386,000
Net Carrying Amount	$ 33,127,000	$ 27,984,000
Trademarks and other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	16 years 8 months 12 days	16 years 4 months 22 days
Gross Carrying Amount	$ 31,026,000	$ 28,894,000
Accumulated Amortization	12,613,000	10,563,000
Net Carrying Amount	$ 18,413,000	$ 18,331,000