Stock-Based Compensation (Status for Options Which Contain Vesting Provisions) (Details) - $ / shares	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Options
Balance as of beginning of year (in shares)	1,744,931
Granted (in shares)	1,004,631
Vested (in shares)	(849,496)
Cancelled (in shares)	(55,176)
Balance as of ending of year (in shares)	1,844,890	1,744,931
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 11.18
Granted (in dollars per share)	10.23	$ 10.93	$ 12.27
Vested (in dollars per share)	10.94
Canceled (in dollars per share)	10.65
Ending balance (in dollars per share)	$ 10.79	$ 11.18