Equity (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 05, 2022	Dec. 15, 2021	Sep. 29, 2021	Jan. 05, 2021	Feb. 28, 2022	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Class of Stock [Line Items]
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased						5,800,000		5,800,000
Proceeds from exercise of stock options								$ 137	$ 686
Number of common stock options exercise								1,010,000	81,041
Number of common stock options exercise, value						$ 137		$ 137	$ 686
Increase in additional paid-in capital for stock-based compensation						$ 1,245	$ 275	1,840	1,215
2015 Stock Option and Incentive Plan [Member]
Class of Stock [Line Items]
Proceeds from exercise of stock options								1,300	$ 700
Common Class B [Member]
Class of Stock [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized		175,000
Common Class B [Member] | National Retail Solutions [Member]
Class of Stock [Line Items]
Capital stock outstanding percentage			2.50%		0.50%
Increase in additional paid-in capital for stock-based compensation					$ 1,200
Common Class B [Member] | Howard S. Jonas [Member]
Class of Stock [Line Items]
Number of common stock options exercise, value								$ 3,900
Number of common stock options exercise								1,000,000.0
Share-based compensation, exercise price								$ 14.93
Share-based compensation, expiration date								May 01, 2022
Number of common stock options exercise								528,635
Number of common stock options exercise, value								$ 14,900
Number of common stock options exercise								137,364
Common Class B [Member] | Deferred Stock Units [Member]
Class of Stock [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period	301,296			283,838
Class B Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased						8,000,000.0		8,000,000.0
Treasury Stock, Shares, Acquired									463,792
Number of common stock options exercise, value									$ 2,800
Class B Common Stock [Member] | Employees [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired								200,438	109,381
Number of common stock options exercise, value								$ 9,000	$ 1,300