Intangible Assets (Intangible Assets with Finite Lives) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Jul. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 418,233,000		$ 418,233,000
Accumulated Amortization	165,780,000		160,214,000
Net Carrying Amount	252,453,000		$ 258,019,000
Amortization of intangibles	$ 5,566,000	$ 5,206,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	20 years 4 months 24 days		20 years 4 months 24 days
Gross Carrying Amount	$ 286,058,000		$ 286,058,000
Accumulated Amortization	82,845,000		79,534,000
Net Carrying Amount	$ 203,213,000		$ 206,524,000
Technologies
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	14 years		14 years
Gross Carrying Amount	$ 99,349,000		$ 99,349,000
Accumulated Amortization	66,908,000		65,398,000
Net Carrying Amount	$ 32,441,000		$ 33,951,000
Trademarks and other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	16 years 7 months 6 days		16 years 7 months 6 days
Gross Carrying Amount	$ 32,826,000		$ 32,826,000
Accumulated Amortization	16,027,000		15,282,000
Net Carrying Amount	$ 16,799,000		$ 17,544,000