Revenue Recognition (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021	Jul. 31, 2021
Revenue from Contract with Customer [Abstract]
Contract with Customer, Liability	$ 2,610,000		$ 2,610,000		$ 2,519,000
Deferred Revenue, Revenue Recognized	$ 296,000	$ 294,000	$ 585,000	$ 591,000
Remaining Performance Obligations Expected as Revenue During the Remainder of the Current Fiscal Year	22.00%		22.00%
Remaining Performance Obligations Expected as Revenue Over the Next Full Fiscal Year	35.00%		35.00%