Stock-Based Compensation (Stock Options) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Additional Disclosures
Common stock issued for net settlement of stock-based awards (in shares)	27,994	9,345	8,706
Stock options
Awards (In Shares)
Outstanding, Beginning Balance (in shares)	1,555,555	1,668,975	1,855,875
Granted (in shares)	327,100
Expired/canceled (in shares)	(174,840)	(32,490)	(72,190)
Exercised (in shares)	(285,790)	(80,930)	(114,710)
Outstanding, Ending Balance (in shares)	1,422,025	1,555,555	1,668,975
Exercisable, Ending Balance (in shares)	1,036,435
Vested and Expected to Vest, Ending Balance (in shares)	1,404,387
Weighted Average Exercise Price (Per Share)
Outstanding, Beginning Balance (in dollars per share)	$ 28.72	$ 28.72	$ 28.60
Granted (in dollars per share)	17.88
Expired/canceled (in dollars per share)	29.06	30.11	27.58
Exercised (in dollars per share)	28.82	28.18	27.44
Outstanding, Ending Balance (in dollars per share)	26.17	$ 28.72	$ 28.72
Exercisable, Ending Balance (in dollars per share)	28.73
Vested and Expected to Vest, Ending Balance (in dollars per share)	$ 26.25
Weighted Average Remaining Contractual Term (Years)
Outstanding, Ending Balance	4 years 6 months 3 days
Exercisable, Ending Balance	2 years 9 months 18 days
Vested And Expected To Vest, Ending Balance	4 years 5 months 15 days
Aggregated Intrinsic Value
Outstanding, Ending Balance	$ 0
Exercisable, Ending Balance	0
Vested and Expected to Vest, Ending Balance	$ 0
Additional Disclosures
Exercise price, lower range limit (in dollars per share)	$ 17.88
Exercise price, upper range limit (in dollars per share)	$ 33.94
Total intrinsic value relating to stock-based awards exercised during the period	$ 1,869,000	$ 576,000	$ 469,000
Vested stock-based awards net settled upon exercise (in shares)	269,090	72,830	101,610
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
Stock options | Minimum
Additional Disclosures
Contractual term (in years)	5 years
Stock options | Maximum
Additional Disclosures
Contractual term (in years)	10 years
Stock options | Tranche One
Additional Disclosures
Vesting period (in years)	3 years
Stock options | Tranche Two
Additional Disclosures
Vesting period (in years)	5 years