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	AOCI Attributable to Parent
Beginning Balances at Jul. 31, 2021	$ 963,028			$ 548	$ 339,125	$ 788,369			$ (109,061)	$ (55,953)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	35,046					35,046
Other comprehensive loss, net of tax	(4,718)									(4,718)
Issuance of shares of Class A Common Stock under stock plan	3,188				3,187				(1)
Tax benefit and withholdings from deferred compensation distributions	115				115
Stock-based compensation expense	4,129				4,129
Repurchase of shares of Class A Common Stock	(18,924)								18,924
Common Stock, Dividends, Per Share, Cash Paid		$ 0.2250	$ 0.2084
Dividends, Common Stock, Cash		$ 10,858	$ 737				$ 10,858	$ 737
Ending Balances at Oct. 31, 2021	963,893			548	340,182	811,820			(127,986)	(60,671)
Beginning Balances at Jul. 31, 2022	911,298			548	345,266	892,417			(217,856)	(109,077)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	39,441
Other comprehensive loss, net of tax	(17,437)									(17,437)
Issuance of shares of Class A Common Stock under stock plan	1,155				2,226				1,071
Tax benefit and withholdings from deferred compensation distributions	66				66
Stock-based compensation expense	2,958				2,958
Repurchase of shares of Class A Common Stock	(12,070)								12,070
Common Stock, Dividends, Per Share, Cash Paid		$ 0.2300	$ 0.2134
Dividends, Common Stock, Cash		$ 10,621	$ 755				$ 10,621	$ 755
Ending Balances at Oct. 31, 2022	$ 911,725			$ 548	$ 346,064	$ 920,482			$ (228,855)	$ (126,514)