Stock-Based Compensation (Performance Shares, RSUs, Restricted Stock and Share Unit Awards) (Details)		3 Months Ended			12 Months Ended
	Jul. 31, 2017	Oct. 31, 2021 USD ($) $ / shares shares	Apr. 30, 2021 $ / shares shares	Oct. 31, 2020 USD ($)	Jul. 31, 2019	Jul. 31, 2021 USD ($)	Jul. 31, 2020	Jul. 31, 2018
Dividend Equivalents [Abstract]
Accrued during the period		$ 88,000		$ 142,000
Carrying value at period end		396,960,000				$ 492,392,000
Income tax (expense) benefit from settlement of stock-based awards		$ 53,000		(199,000)
Performance shares, RSUs, Restricted stock and share units
Awards (In Shares)
Outstanding, Beginning Balance (in shares) | shares		1,068,370
Granted (in shares) | shares			228,161
Settled (in shares) | shares			(190,310)
Canceled/Forfeited (in shares) | shares			(40,880)
Outstanding, Ending Balance (in shares) | shares		1,065,341
Vested, Ending Balance (in shares) | shares		353,816
Vested and Expected to Vest, Ending Balance (in shares) | shares		1,015,655
Weighted Average Grant Date Fair Value
Outstanding, Beginning Balance (in dollars per share) | $ / shares		$ 21.93
Granted (in dollars per share) | $ / shares			$ 26.81
Settled (in dollars per share) | $ / shares			23.97
Canceled/Forfeited (in dollars per share) | $ / shares			$ 23.15
Outstanding, Ending Balance (in dollars per share) | $ / shares		22.56
Vested, Ending Balance (in dollars per share) | $ / shares		21.94
Vested and Expected to Vest, Ending Balance (in dollars per share) | $ / shares		$ 22.54
Aggregate Intrinsic Value
Outstanding, Ending Balance		$ 22,979,000
Vested, Ending Balance		7,632,000
Vested and Expected to Vest, Ending Balance		21,908,000
Additional Disclosures
Total intrinsic value relating to fully vested stock-based awards converted during the period		$ 4,895,000		2,896,000
Performance shares | Employees | Granted since fiscal 2014
Additional Disclosures
Performance period (in years)		3 years
RSUs and restricted stock | Employees
Additional Disclosures
Vesting period (in years)		5 years
Common stock, conversion ratio (in shares)		1
RSUs and restricted stock | Non-Employee Director
Additional Disclosures
Vesting period (in years)		5 years			3 years
Common stock, conversion ratio (in shares)							1
Share units
Additional Disclosures
Common stock, conversion ratio (in shares)								1
Conversion period of vested share units	1 year
Number of units settled to date (in shares) | shares		956,576
Dividend equivalents
Dividend Equivalents [Abstract]
Accrued during the period		$ 88,000		142,000
Paid during the period		315,000		$ 275,000
Carrying value at period end		$ 657,000				$ 884,000