Stock Repurchase Plan (Details) - USD ($) $ in Thousands	12 Months Ended			209 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2023	Mar. 07, 2023	Dec. 04, 2015	Jul. 16, 2008	Mar. 09, 2006
Accelerated Share Repurchases [Line Items]
Treasury Stock, Shares, Acquired	2,182,594	304,567
Treasury Stock, Common, Shares	8,648,302	6,466,000		8,648,302
Repurchases of Common Stock	$ 500,000	$ 75,006	$ 0	$ 979,400
Stock Repurchase Program, Additional Number of Shares Authorized to be Repurchased					2,500,000	1,500,000	3,000,000
Repurchases of Common Stock	$ 500,000	$ 75,006	$ 0	$ 979,400
Number of shares authorized to repurchase	10,000,000			10,000,000				3,000,000
Number of shares repurchased since inception	8,648,302	6,466,000		8,648,302
Remaining shares available for repurchase under existing program	1,351,698			1,351,698
Sales and Excise Tax Payable	$ 4,900			$ 4,900