Stock-Based Compensation (Performance Shares, RSUs, Restricted Stock and Share Unit Awards) (Details)	12 Months Ended
	Jul. 31, 2021 USD ($) $ / shares shares	Jul. 31, 2020 USD ($) $ / shares shares	Jul. 31, 2019 USD ($) $ / shares shares	Jul. 31, 2018 $ / shares shares	Jul. 31, 2016
Dividend Equivalents [Abstract]
Accrued during the period | $	$ 380,000	$ 294,000	$ 327,000
Carrying value at period end | $	492,392,000	380,348,000
Income tax benefit from settlement of stock-based awards | $	$ 142,000	$ (224,000)	$ 479,000
Performance Shares, RSUs, Restricted Stock and Share Units
Awards (In Shares)
Outstanding, Beginning Balance (in shares)	999,574	954,676	818,438
Granted (in shares)	644,272	560,361	442,363
Settled (in shares)	(455,564)	(431,581)	(275,619)
Canceled/Forfeited (in shares)	(119,912)	(83,882)	(30,506)
Outstanding, Ending Balance (in shares)	1,068,370	999,574	954,676	818,438
Vested, Ending Balance (in shares)	373,522
Vested and Expected to Vest, Ending Balance (in shares)	1,023,923
Weighted Average Grant Date Fair Value
Outstanding, Beginning Balance (in dollars per share) | $ / shares	$ 21.15	$ 22.40	$ 19.78
Granted (in dollars per share) | $ / shares	19.06	19.93	29.76
Settled (in dollars per share) | $ / shares	17.09	22.02	26.05
Canceled/Forfeited (in dollars per share) | $ / shares	18.42	22.84	25.52
Outstanding, Ending Balance (in dollars per share) | $ / shares	21.93	$ 21.15	$ 22.40	$ 19.78
Vested, Ending Balance (in dollars per share) | $ / shares	21.84
Vested and Expected to Vest, Ending Balance (in dollars per share) | $ / shares	$ 21.93
Aggregate Intrinsic Value
Outstanding, Ending Balance | $	$ 26,677,000
Vested, Ending Balance | $	9,327,000
Vested and Expected to Vest, Ending Balance | $	25,567,000
Additional Disclosures
Total intrinsic value relating to fully vested stock-based awards converted during the period | $	$ 9,878,000	$ 9,635,000	$ 8,772,000
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
Awards (In Shares)
Granted (in shares)	253,257
Additional Disclosures
Common stock, conversion ratio (in shares)					1
Conversion period of vested share units	1 year
Granted units converted into common stock (in shares)	266,354
Number of shares issued as result of conversion	98,502
Number of units settled to date (in shares)	949,357
Dividend equivalents
Dividend Equivalents [Abstract]
Accrued during the period | $	$ 380,000	294,000	327,000
Paid during the period | $	279,000	288,000	$ 263,000
Carrying value at period end | $	$ 884,000	$ 783,000