Revenue Recognition (Details) - USD ($)	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Jul. 31, 2021
Revenue Recognition [Abstract]
Contract with Customer, Liability	$ 2,589,000		$ 2,519,000
Deferred Revenue, Revenue Recognized	$ 289,000	$ 297,000
Remaining Performance Obligations Expected as Revenue During the Remainder of the Current Fiscal Year	32.00%
Remaining Performance Obligations Expected as Revenue Over the Next Full Fiscal Year	31.00%