Stock-Based Compensation (Stock Options) (Details) - Stock options - USD ($)	3 Months Ended
	Oct. 31, 2021	Apr. 30, 2021	Oct. 31, 2020	Oct. 31, 2019
Awards (In Shares)
Outstanding, Beginning Balance (in shares)	1,073,435
Expired/canceled (in shares)		(56,250)
Outstanding, Ending Balance (in shares)	1,015,965
Exercisable, Ending Balance (in shares)	780,525
Vested and Expected to Vest, Ending Balance (in shares)	1,003,360
Weighted Average Exercise Price (Per Share)
Outstanding, Beginning Balance (in dollars per share)	$ 25.76
Expired/canceled (in dollars per share)		$ 27.59
Outstanding, Ending Balance (in dollars per share)		$ 25.66
Exercisable, Ending Balance (in dollars per share)	28.01
Vested and Expected to Vest, Ending Balance (in dollars per share)	$ 25.76
Weighted Average Remaining Contractual Term (Years)
Outstanding, Ending Balance	4 years 2 months 8 days
Exercisable, Ending Balance	2 years 10 months 13 days
Vested And Expected To Vest, Ending Balance	4 years 1 month 17 days
Aggregated Intrinsic Value
Outstanding, Ending Balance	$ 1,087,000
Exercisable, Ending Balance	218,000
Vested and Expected to Vest, Ending Balance	$ 1,041,000
Additional Disclosures
Exercise price, lower range limit (in dollars per share)	$ 17.88
Exercise price, upper range limit (in dollars per share)	$ 33.94
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				(1,220)
Exercised (in dollars per share)				$ 17.88
Total intrinsic value relating to stock-based awards exercised during the period	$ 7,000		$ 0
Maximum
Additional Disclosures
Contractual term (in years)	10 years
Tranche Two
Additional Disclosures
Vesting period (in years)	5 years