Revenue Recognition (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Jul. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract with Customer, Liability	$ 2,567,000		$ 2,567,000		$ 2,559,000
Deferred Revenue, Revenue Recognized	$ 291,000	$ 317,000	$ 882,000	$ 948,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation			Of the contract liability balance outstanding at April 30, 2021, the Company expects to recognize 11% by the end of fiscal 2021, an additional 38% by the end of fiscal 2022, and the remaining balance thereafter.