Condensed Statements of Shareholder's Equity Condensed Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Common Stock [Member] Stock Options and Stock Appreciation Rights [ Member]	Common Stock [Member] Performance Shares [Member]	Common Stock [Member] Restricted Stock Units (RSUs) [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Stock Options and Stock Appreciation Rights [ Member]	Additional Paid-in Capital [Member] Performance Shares [Member]	Additional Paid-in Capital [Member] Restricted Stock Units (RSUs) [Member]	Retained Earnings [Member]	Treasury Shares- at Cost	Treasury Shares- at Cost Stock Options and Stock Appreciation Rights [ Member]	Treasury Shares- at Cost Performance Shares [Member]	Treasury Shares- at Cost Restricted Stock Units (RSUs) [Member]	Total Accumulated Other Comprehensive Income (Loss) [Member]	Parent [Member]	Parent [Member] Stock Options and Stock Appreciation Rights [ Member]	Parent [Member] Performance Shares [Member]	Parent [Member] Restricted Stock Units (RSUs) [Member]
Beginning balance, shares at Jun. 30, 2022		38,499
Beginning balance at Jun. 30, 2022		$ 10,000				$ 183,822				$ 1,499,676	$ (471,848)				$ (72,295)	$ 1,149,355
Net income	$ 76,880															76,880
Other comprehensive (loss) income															(1,635)	(1,635)
Cash Dividends per Common Share	$ 0.34
Treasury Stock, Shares, Acquired		(8)
Treasury Stock, Value, Acquired, Cost Method											(716)					(716)
Exercise of stock appreciation rights and options, shares			21
Performance share awards, shares				23
Restricted stock units, shares					33
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							$ (860)	$ (1,290)	$ (1,668)
Exercise of stock appreciation rights and options												$ (366)
Performance share awards													$ (758)
Restricted stock units														$ (902)
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	$ (1,226)	$ (2,048)	$ (2,570)
Compensation expense						1,939	1,424									1,939	1,424
Stockholders' Equity, Other Shares		3
Other						(19)				(5)	61					37
Ending balance, shares at Sep. 30, 2022		38,571
Ending balance at Sep. 30, 2022		$ 10,000				183,348				1,576,551	(474,529)				(73,930)	1,221,440
Beginning balance, shares at Jun. 30, 2022		38,499
Beginning balance at Jun. 30, 2022		$ 10,000				183,822				1,499,676	(471,848)				(72,295)	1,149,355
Net income	$ 254,524
Other comprehensive (loss) income	6,651														6,651
Ending balance, shares at Mar. 31, 2023		38,654
Ending balance at Mar. 31, 2023		$ 10,000				186,187				1,727,534	(477,417)				(65,644)	1,380,660
Beginning balance, shares at Sep. 30, 2022		38,571
Beginning balance at Sep. 30, 2022		$ 10,000				183,348				1,576,551	(474,529)				(73,930)	1,221,440
Net income	$ 80,457															80,457
Other comprehensive (loss) income															6,544	6,544
Cash Dividends per Common Share	$ 0.34
Cash dividends										(13,175)						(13,175)
Exercise of stock appreciation rights and options, shares			28
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							(1,061)
Exercise of stock appreciation rights and options												(878)
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	(1,939)
Compensation expense						2,062	447									2,062	447
Other						(1)				41						40
Ending balance, shares at Dec. 31, 2022		38,599
Ending balance at Dec. 31, 2022		$ 10,000				184,795				1,643,874	(475,407)				(67,386)	1,295,876
Net income	$ 97,187															97,187
Other comprehensive (loss) income	$ 1,742														1,742	1,742
Cash Dividends per Common Share	$ 0.35
Cash dividends										(13,562)						(13,562)
Exercise of stock appreciation rights and options, shares			40
Restricted stock units, shares					1
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							(2,173)		(44)
Exercise of stock appreciation rights and options												(2,401)
Restricted stock units														(30)
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	(4,574)		(74)
Compensation expense						3,418	451									3,418	451
Stockholders' Equity, Other Shares		14
Other						(260)				35	421					196
Ending balance, shares at Mar. 31, 2023		38,654
Ending balance at Mar. 31, 2023		$ 10,000				186,187				1,727,534	(477,417)				(65,644)	1,380,660
Beginning balance, shares at Jun. 30, 2023		38,657
Beginning balance at Jun. 30, 2023	$ 1,458,437	$ 10,000				188,646				1,792,632	(477,545)				(55,296)	1,458,437
Net income	$ 93,826															93,826
Other comprehensive (loss) income															(7,074)	(7,074)
Cash Dividends per Common Share	$ 0.35
Cash dividends										(23)						(23)
Exercise of stock appreciation rights and options, shares			32
Performance share awards, shares				54
Restricted stock units, shares					13
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							(1,681)	$ (3,072)	(726)
Exercise of stock appreciation rights and options												(1,912)
Performance share awards													$ (3,487)
Restricted stock units														(910)
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	(3,593)	$ (6,559)	(1,636)
Compensation expense						1,976	844									1,976	844
Stockholders' Equity, Other Shares		(1)
Other						(1)				(3)	(78)					(82)
Ending balance, shares at Sep. 30, 2023		38,755
Ending balance at Sep. 30, 2023		$ 10,000				185,986				1,886,432	(483,932)				(62,370)	1,536,116
Beginning balance, shares at Jun. 30, 2023		38,657
Beginning balance at Jun. 30, 2023	$ 1,458,437	$ 10,000				188,646				1,792,632	(477,545)				(55,296)	1,458,437
Net income	282,271
Other comprehensive (loss) income	(9,193)														(9,193)
Ending balance, shares at Mar. 31, 2024		38,640
Ending balance at Mar. 31, 2024	1,669,024	$ 10,000				191,133				2,046,956	(514,576)				(64,489)	1,669,024
Beginning balance, shares at Sep. 30, 2023		38,755
Beginning balance at Sep. 30, 2023		$ 10,000				185,986				1,886,432	(483,932)				(62,370)	1,536,116
Net income	$ 91,228															91,228
Other comprehensive (loss) income															2,724	2,724
Cash Dividends per Common Share	$ 0.35
Cash dividends										(13,607)						(13,607)
Treasury Stock, Shares, Acquired		(63)
Treasury Stock, Value, Acquired, Cost Method											(10,677)					(10,677)
Exercise of stock appreciation rights and options, shares			11
Restricted stock units, shares					1
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							(391)		(86)
Exercise of stock appreciation rights and options												(335)
Restricted stock units														(108)
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	(726)		(194)
Compensation expense						2,261	866									2,261	866
Stockholders' Equity, Other Shares		1
Other										37						37
Ending balance, shares at Dec. 31, 2023		38,705
Ending balance at Dec. 31, 2023		$ 10,000				188,636				1,964,090	(495,052)				(59,646)	1,608,028
Net income	$ 97,217															97,217
Other comprehensive (loss) income	$ (4,843)														(4,843)	(4,843)
Cash Dividends per Common Share	$ 0.37
Cash dividends										(14,360)						(14,360)
Treasury Stock, Shares, Acquired		(100)
Treasury Stock, Value, Acquired, Cost Method											(18,198)					(18,198)
Exercise of stock appreciation rights and options, shares			27
Restricted stock units, shares					1
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							(1,365)		$ (47)
Exercise of stock appreciation rights and options												$ (1,495)
Restricted stock units														$ (53)
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	(2,860)		$ (100)
Compensation expense						3,271	$ 860									3,271	$ 860
Stockholders' Equity, Other Shares		7
Other						(222)				9	222					9
Ending balance, shares at Mar. 31, 2024		38,640
Ending balance at Mar. 31, 2024	$ 1,669,024	$ 10,000				$ 191,133				$ 2,046,956	$ (514,576)				$ (64,489)	$ 1,669,024