Stock-Based Compensation (Stock Options) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Awards (In Shares)
Outstanding, Beginning Balance (in shares)	1,422,025	1,555,555	1,668,975
Granted (in shares)	0	327,100	0
Expired/canceled (in shares)	(348,590)	(174,840)	(32,490)
Exercised (in shares)		(285,790)	(80,930)
Outstanding, Ending Balance (in shares)	1,073,435	1,422,025	1,555,555
Exercisable, Ending Balance (in shares)	835,755
Vested and Expected to Vest, Ending Balance (in shares)	1,060,830
Weighted Average Exercise Price (Per Share)
Outstanding, Beginning Balance (in dollars per share)	$ 26.17	$ 28.72	$ 28.72
Granted (in dollars per share)		17.88
Expired/canceled (in dollars per share)	27.44	29.06	30.11
Exercised (in dollars per share)		28.82	28.18
Outstanding, Ending Balance (in dollars per share)	25.76	$ 26.17	$ 28.72
Exercisable, Ending Balance (in dollars per share)	28.00
Vested and Expected to Vest, Ending Balance (in dollars per share)	$ 25.85
Weighted Average Remaining Contractual Term (Years)
Outstanding, Ending Balance	4 years 3 months 21 days
Exercisable, Ending Balance	3 years 10 days
Vested And Expected To Vest, Ending Balance	4 years 3 months 3 days
Aggregated Intrinsic Value
Outstanding, Ending Balance	$ 2,178,000
Exercisable, Ending Balance	492,000
Vested and Expected to Vest, Ending Balance	$ 2,088,000
Additional Disclosures
Exercise price, lower range limit (in dollars per share)	$ 17.88
Exercise price, upper range limit (in dollars per share)	$ 33.94
Stock options
Additional Disclosures
Contractual term (in years)	10 years
Vesting period (in years)	5 years
Total intrinsic value relating to stock-based awards exercised during the period	$ 0	$ 1,869,000	$ 576,000
Vested stock-based awards net settled upon exercise (in shares)		269,090	72,830
Common stock issued for net settlement of stock-based awards (in shares)		27,994	9,345
Weighted average grant-date fair value (in dollars per share)		$ 5.52
Expected dividend yield (as a percent)		2.24%
Expected volatility (as a percent)		40.03%
Risk-free interest rate (as a percent)		0.54%
Expected life		6 years 6 months