Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Foreign Currency Translation Adjustments [Member]	Unrealized Derivative Gains (Losses) [Member]	Minimum Retirement Benefit Liability Adjustments [Member]	Total Accumulated Other Comprehensive (Loss) Earnings [Member]	Deferred Compensation [Member]	Retained Earnings [Member]	Treasury Stock at Cost [Member]	Treasury Stock Held for Deferred Compensation [Member]
Balances at Sep. 30, 2023	$ 2,070,989	$ 106	$ 327,941	$ (67,393)	$ (9,719)	$ 6,441	$ (70,671)	$ 2,776	$ 2,908,574	$ (1,094,961)	$ (2,776)
Net earnings	289,675								289,675
Other comprehensive earnings (loss), net of tax	5,843			4,792	1,207	(156)	5,843
Cash dividends paid	(43,457)								(43,457)
Purchases of treasury stock	(304,811)									(304,811)
Sales of treasury stock	90,109		24,391							65,718
Common shares issued for benefit plans	22,937		13,966							8,971
Stock-based compensation	27,926		27,926
Purchases of stock by deferred compensation								127			(127)
Distribution of stock from deferred compensation								126			(126)
Balances at Jun. 30, 2024	2,159,211	106	394,224	(62,601)	(8,512)	6,285	(64,828)	3,029	3,154,792	(1,325,083)	(3,029)
Balances at Mar. 31, 2024	2,329,413	106	374,278	(56,378)	(11,442)	6,419	(61,401)	3,032	3,067,847	(1,051,417)	(3,032)
Net earnings	102,075								102,075
Other comprehensive earnings (loss), net of tax	(3,427)			(6,223)	2,930	(134)	(3,427)
Cash dividends paid	(15,130)								(15,130)
Purchases of treasury stock	(304,811)									(304,811)
Sales of treasury stock	42,018		11,923							30,095
Common shares issued for benefit plans	1,050		0							1,050
Stock-based compensation	8,023		8,023
Purchases of stock by deferred compensation								48			(48)
Distribution of stock from deferred compensation								(51)			51
Balances at Jun. 30, 2024	2,159,211	106	394,224	(62,601)	(8,512)	6,285	(64,828)	3,029	3,154,792	(1,325,083)	(3,029)
Balances at Sep. 30, 2024	2,176,416	106	396,554	(39,129)	(5,177)	11,608	(32,698)	2,662	3,223,259	(1,410,805)	(2,662)
Net earnings	304,488								304,488
Other comprehensive earnings (loss), net of tax	13,838			18,134	(4,595)	299	13,838
Cash dividends paid	(48,195)								(48,195)
Purchases of treasury stock	(124,276)									(124,276)
Sales of treasury stock	95,893		32,884							63,009
Common shares issued for benefit plans	24,912		18,378							6,534
Stock-based compensation	25,490		25,490
Purchases of stock by deferred compensation								116			(116)
Distribution of stock from deferred compensation								(1,023)			1,023
Balances at Jun. 30, 2025	2,468,566	106	473,306	(20,995)	(9,772)	11,907	(18,860)	1,755	3,479,552	(1,465,538)	(1,755)
Balances at Mar. 31, 2025	2,337,507	106	449,152	(54,652)	(7,334)	11,508	(50,478)	1,763	3,387,846	(1,449,119)	(1,763)
Net earnings	108,448								108,448
Other comprehensive earnings (loss), net of tax	31,618			33,657	(2,438)	399	31,618
Cash dividends paid	(16,742)								(16,742)
Purchases of treasury stock	(44,783)									(44,783)
Sales of treasury stock	46,404		18,040							28,364
Common shares issued for benefit plans	24,058
Stock-based compensation	6,114		6,114
Purchases of stock by deferred compensation								34			(34)
Distribution of stock from deferred compensation								(42)			42
Balances at Jun. 30, 2025	$ 2,468,566	$ 106	$ 473,306	$ (20,995)	$ (9,772)	$ 11,907	$ (18,860)	$ 1,755	$ 3,479,552	$ (1,465,538)	$ (1,755)