Intangible Assets (Intangible Assets with Finite Lives) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 418,233,000	$ 400,509,000
Accumulated Amortization	160,214,000	138,619,000
Net Carrying Amount	258,019,000	261,890,000
Amortization of intangibles	$ 21,595,000	$ 18,320,000	$ 21,075,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	20 years 4 months 24 days	20 years 6 months
Gross Carrying Amount	$ 286,058,000	$ 276,834,000
Accumulated Amortization	79,534,000	66,484,000
Net Carrying Amount	$ 206,524,000	$ 210,350,000
Technologies
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	14 years	12 years 8 months 12 days
Gross Carrying Amount	$ 99,349,000	$ 92,649,000
Accumulated Amortization	65,398,000	59,522,000
Net Carrying Amount	$ 33,951,000	$ 33,127,000
Trademarks and other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	16 years 7 months 6 days	16 years 8 months 12 days
Gross Carrying Amount	$ 32,826,000	$ 31,026,000
Accumulated Amortization	15,282,000	12,613,000
Net Carrying Amount	$ 17,544,000	$ 18,413,000