CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Class A Nonvoting Common Stock	Retained Earnings [Member] Class B Voting Common Stock	Treasury Stock, Common	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balances at Jul. 31, 2021		$ 548	$ 339,125	$ 788,369			$ (109,061)	$ (55,953)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 149,979
Other Comprehensive Income (Loss), Net of Tax	(53,124)							(53,124)
Issuance of shares of Class A Common Stock under stock plan			(4,478)				(434)
Tax benefit and withholdings from deferred compensation distributions			115
Stock-based compensation expense (Note 7)			10,504
Repurchase of shares of Class A Common Stock, including excise taxes							109,229
Dividends, Common Stock, Cash					$ (42,805)	$ (3,126)
Ending Balances at Jul. 31, 2022		548	345,266	892,417			(217,856)	(109,077)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	174,857
Other Comprehensive Income (Loss), Net of Tax	16,016							16,016
Issuance of shares of Class A Common Stock under stock plan			(1,069)				(3,119)
Tax benefit and withholdings from deferred compensation distributions			66
Stock-based compensation expense (Note 7)			7,508
Repurchase of shares of Class A Common Stock, including excise taxes							75,472
Dividends, Common Stock, Cash					(42,207)	(3,197)
Ending Balances at Jul. 31, 2023	990,919	548	351,771	1,021,870			(290,209)	(93,061)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	197,215
Other Comprehensive Income (Loss), Net of Tax	(16,561)							(16,561)
Issuance of shares of Class A Common Stock under stock plan			(5,627)				(11,016)
Tax benefit and withholdings from deferred compensation distributions			149
Stock-based compensation expense (Note 7)			7,361
Repurchase of shares of Class A Common Stock, including excise taxes							(72,754)
Dividends, Common Stock, Cash					$ (41,793)	$ (3,267)
Ending Balances at Jul. 31, 2024	$ 1,066,658	$ 548	$ 353,654	$ 1,174,025			$ (351,947)	$ (109,622)