Earnings Per Share (Details) - Schedule of dilutive earnings per share computations - shares	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Shares excluded from the calculation of diluted earnings per share	354,000	14,000	287,000	215,000
Stock options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Shares excluded from the calculation of diluted earnings per share	65,000	14,000	57,000	215,000
Non-vested restricted Class B common stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Shares excluded from the calculation of diluted earnings per share
Deferred stock units [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Shares excluded from the calculation of diluted earnings per share	289,000		230,000