Equity (Details) - USD ($)	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Stock Repurchases [Member]
Equity (Details) [Line Items]
Shares remained available for repurchase under the stock repurchase program	5,800,000
Common Class B [Member]
Equity (Details) [Line Items]
Aggregate repurchased shares	8,000,000.0
Proceeds from the exercise of stock options (in Dollars)	$ 200,000	$ 300,000
Class B common stock shares repurchased	21,894	32,551
Common Class B [Member] | Employees [Member]
Equity (Details) [Line Items]
Class B common stock shares repurchased	1,053
Aggregate purchase price of shares repurchased (in Dollars)	$ 7,000
Common Class B [Member] | Stock Repurchases [Member]
Equity (Details) [Line Items]
Class B common stock shares repurchased	463,792
Aggregate purchase price of shares repurchased (in Dollars)	$ 2,800,000