CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Class A Nonvoting Common Stock [Member]	Class B Voting Common Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Class A Nonvoting Common Stock [Member]	Retained Earnings [Member] Class B Voting Common Stock [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]
Beginning balance at Jul. 31, 2020	$ 863,072			$ 548	$ 331,761	$ 704,456			$ (107,216)	$ (66,477)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	64,341					64,341
Other Comprehensive Income (Loss), Net of Tax	15,016									15,016
Issuance of shares of Class A Common Stock under stock plan	(2,167)				(3,187)				(1,020)
Tax benefit and withholdings from deferred compensation distributions	32				32
Stock-based compensation expense	5,471				5,471
Repurchase of shares of Class A Common Stock	(3,593)								(3,593)
Dividends, Common Stock, Cash		$ (21,338)	$ (1,499)				$ (21,338)	$ (1,499)
Ending balance at Jan. 31, 2021	919,335			548	334,077	745,960			(109,789)	(51,461)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared							$ 0.4400	$ 0.4234
Beginning balance at Oct. 31, 2020	880,401			548	332,121	726,546			(109,146)	(69,668)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30,860					30,860
Other Comprehensive Income (Loss), Net of Tax	18,207									18,207
Issuance of shares of Class A Common Stock under stock plan	(289)				59				(230)
Stock-based compensation expense	1,897				1,897
Repurchase of shares of Class A Common Stock	(873)								(873)
Dividends, Common Stock, Cash		(10,667)	(779)				$ (10,667)	$ (779)
Ending balance at Jan. 31, 2021	919,335			548	334,077	745,960			(109,789)	(51,461)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared							$ 0.2200	$ 0.2200
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	68,861					68,861
Other Comprehensive Income (Loss), Net of Tax	(22,986)									(22,986)
Issuance of shares of Class A Common Stock under stock plan	(4,651)				(4,521)				(130)
Tax benefit and withholdings from deferred compensation distributions	115				115
Stock-based compensation expense	7,170				7,170
Repurchase of shares of Class A Common Stock	(21,720)								(21,720)
Dividends, Common Stock, Cash		(21,715)	$ (1,534)				$ (21,715)	$ (1,534)
Ending balance at Jan. 31, 2022	966,568			548	341,889	833,981			(130,911)	(78,939)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared			$ 0.4334				$ 0.4500
Beginning balance at Oct. 31, 2021	963,893			548	340,182	811,820			(127,986)	(60,671)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,815					33,815
Other Comprehensive Income (Loss), Net of Tax	(18,268)									(18,268)
Issuance of shares of Class A Common Stock under stock plan	(1,463)				(1,334)				(129)
Stock-based compensation expense	3,041				3,041
Repurchase of shares of Class A Common Stock	(2,796)								(2,796)
Dividends, Common Stock, Cash		$ (10,857)	$ (797)				$ (10,857)	$ (797)
Ending balance at Jan. 31, 2022	$ 966,568			$ 548	$ 341,889	$ 833,981			$ (130,911)	$ (78,939)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared							$ 0.2250	$ 0.2250