CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Class A Nonvoting Common Stock	Class B Voting Common Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Class A Nonvoting Common Stock	Retained Earnings Class B Voting Common Stock	Treasury Stock, Common	Accumulated Other Comprehensive Loss
Beginning balance at Jul. 31, 2021	$ 963,028			$ 548	$ 339,125	$ 788,369			$ (109,061)	$ (55,953)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	108,915					108,915
Other Comprehensive Income (Loss), Net of Tax	(42,935)									(42,935)
Issuance of shares of Class A Common Stock under stock plan	(4,407)				(4,539)				132
Tax benefit and withholdings from deferred compensation distributions	115				115
Stock-based compensation expense	9,153				9,153
Repurchase of shares of Class A Common Stock	84,930								84,930
Dividends, Common Stock, Cash		$ (32,370)	$ (2,331)				$ (32,370)	$ (2,331)
Ending balance at Apr. 30, 2022	914,238			548	343,854	862,583			(193,859)	(98,888)
Beginning balance at Jan. 31, 2022	966,568			548	341,889	833,981			(130,911)	(78,939)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	40,054					40,054
Other Comprehensive Income (Loss), Net of Tax	(19,949)									(19,949)
Issuance of shares of Class A Common Stock under stock plan	244				(18)				262
Stock-based compensation expense	1,983				1,983
Repurchase of shares of Class A Common Stock	63,210								63,210
Dividends, Common Stock, Cash		(10,655)	(797)				(10,655)	(797)
Ending balance at Apr. 30, 2022	914,238			548	343,854	862,583			(193,859)	(98,888)
Beginning balance at Jul. 31, 2022	911,298			548	345,266	892,417			(217,856)	(109,077)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	125,479					125,479
Other Comprehensive Income (Loss), Net of Tax	13,676									13,676
Issuance of shares of Class A Common Stock under stock plan	(2,126)				(1,001)				3,127
Tax benefit and withholdings from deferred compensation distributions	66				66
Stock-based compensation expense	6,427				6,427
Repurchase of shares of Class A Common Stock	29,774								29,774
Dividends, Common Stock, Cash		(31,819)	(2,383)				(31,819)	(2,383)
Ending balance at Apr. 30, 2023	995,096			548	350,758	983,694			(244,503)	(95,401)
Beginning balance at Jan. 31, 2023	967,404			548	348,513	947,051			(233,338)	(95,370)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48,052					48,052
Other Comprehensive Income (Loss), Net of Tax	(31)									(31)
Issuance of shares of Class A Common Stock under stock plan	(947)				199				748
Stock-based compensation expense	2,046				2,046
Repurchase of shares of Class A Common Stock	11,913								11,913
Dividends, Common Stock, Cash		$ (10,595)	$ (814)				$ (10,595)	$ (814)
Ending balance at Apr. 30, 2023	$ 995,096			$ 548	$ 350,758	$ 983,694			$ (244,503)	$ (95,401)