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 Stock [Member]	Treasury Stock [Member] Stock Options and Stock Appreciation Rights [ Member]	Treasury Stock [Member] Performance Shares [Member]	Treasury Stock [Member] 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, 2020		38,710
Beginning balance at Jun. 30, 2020		$ 10,000				$ 176,492				$ 1,200,570	$ (414,090)				$ (129,430)	$ 843,542
Net income	$ 34,784															34,784
Other comprehensive (loss) income															7,509	7,509
Cash dividends										(18)						(18)
Exercise of stock appreciation rights and options, shares			13
Performance share awards, shares				22
Restricted stock units, shares					15
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							$ (277)	$ (985)	$ (593)
Exercise of stock appreciation rights and options												$ (12)
Performance share awards													$ 20
Restricted stock units														$ 96
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	$ (265)	$ (1,005)	$ (497)
Compensation expense						677	693									677	693
Other										15	(29)					(14)
Ending balance, shares at Sep. 30, 2020		38,760
Ending balance at Sep. 30, 2020		$ 10,000				176,007				1,235,351	(414,031)				(121,921)	885,406
Beginning balance, shares at Jun. 30, 2020		38,710
Beginning balance at Jun. 30, 2020		$ 10,000				176,492				1,200,570	(414,090)				(129,430)	843,542
Net income	85,513
Other comprehensive (loss) income	30,559														30,559
Ending balance, shares at Mar. 31, 2021		38,859
Ending balance at Mar. 31, 2021		$ 10,000				177,231				1,260,761	(414,214)				(98,871)	934,907
Beginning balance, shares at Sep. 30, 2020		38,760
Beginning balance at Sep. 30, 2020		$ 10,000				176,007				1,235,351	(414,031)				(121,921)	885,406
Net income	$ (5,334)															(5,334)
Other comprehensive (loss) income															14,557	14,557
Cash Dividends per Common Share	$ 0.32
Cash dividends										(12,483)						(12,483)
Exercise of stock appreciation rights and options, shares			71
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							(3,116)
Exercise of stock appreciation rights and options												(496)
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	(3,612)
Compensation expense						1,490	635									1,490	635
Other										48						48
Ending balance, shares at Dec. 31, 2020		38,831
Ending balance at Dec. 31, 2020		$ 10,000				175,016				1,217,582	(414,527)				(107,364)	880,707
Net income	$ 56,063															56,063
Other comprehensive (loss) income	$ 8,493														8,493	8,493
Cash Dividends per Common Share	$ 0.33
Cash dividends										(12,878)						(12,878)
Exercise of stock appreciation rights and options, shares			11
Restricted stock units, shares					4
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							(379)		(147)
Exercise of stock appreciation rights and options												40
Restricted stock units														(1)
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	(419)		(148)
Compensation expense						2,493	602									2,493	602
Stockholders' Equity, Other Shares		13
Other						(354)				(6)	354					(6)
Ending balance, shares at Mar. 31, 2021		38,859
Ending balance at Mar. 31, 2021		$ 10,000				177,231				1,260,761	(414,214)				(98,871)	934,907
Beginning balance, shares at Jun. 30, 2021		38,516
Beginning balance at Jun. 30, 2021	$ 932,546	$ 10,000				177,014				1,294,413	(455,789)				(93,092)	932,546
Net income	$ 52,969															52,969
Other comprehensive (loss) income															(4,731)	(4,731)
Cash Dividends per Common Share	$ 0.33
Cash dividends										0						0
Treasury Stock, Shares, Acquired		(77)
Treasury Stock, Value, Acquired, Cost Method											(6,537)					(6,537)
Exercise of stock appreciation rights and options, shares			3
Performance share awards, shares				5
Restricted stock units, shares					12
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							(116)	$ (222)	(572)
Exercise of stock appreciation rights and options												(8)
Performance share awards													$ (73)
Restricted stock units														(120)
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	(108)	$ (295)	(692)
Compensation expense						1,563	1,907									1,563	1,907
Stockholders' Equity, Other Shares		(2)
Other										(7)	(45)					(52)
Ending balance, shares at Sep. 30, 2021		38,457
Ending balance at Sep. 30, 2021		$ 10,000				179,574				1,347,375	(462,556)				(97,823)	976,570
Beginning balance, shares at Jun. 30, 2021		38,516
Beginning balance at Jun. 30, 2021	$ 932,546	$ 10,000				177,014				1,294,413	(455,789)				(93,092)	932,546
Net income	178,301
Other comprehensive (loss) income	22,236														22,236
Ending balance, shares at Mar. 31, 2022		38,444
Ending balance at Mar. 31, 2022	1,098,394	$ 10,000				183,100				1,446,847	(470,697)				(70,856)	1,098,394
Beginning balance, shares at Sep. 30, 2021		38,457
Beginning balance at Sep. 30, 2021		$ 10,000				179,574				1,347,375	(462,556)				(97,823)	976,570
Net income	$ 57,026															57,026
Other comprehensive (loss) income															4,888	4,888
Cash Dividends per Common Share	$ 0.33
Cash dividends										(12,759)						(12,759)
Treasury Stock, Shares, Acquired		(35)
Treasury Stock, Value, Acquired, Cost Method											(3,527)					(3,527)
Exercise of stock appreciation rights and options, shares			35
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							(1,639)
Exercise of stock appreciation rights and options												(832)
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	(2,471)
Compensation expense						1,705	609									1,705	609
Stockholders' Equity, Other Shares		(4)
Other						(1)				13	(364)					(352)
Ending balance, shares at Dec. 31, 2021		38,453
Ending balance at Dec. 31, 2021		$ 10,000				180,248				1,391,655	(467,279)				(92,935)	1,021,689
Net income	$ 68,306															68,306
Other comprehensive (loss) income	$ 22,079														22,079	22,079
Cash Dividends per Common Share	$ 0.34
Cash dividends										(13,131)						(13,131)
Treasury Stock, Shares, Acquired		(35)
Treasury Stock, Value, Acquired, Cost Method											(3,540)					(3,540)
Exercise of stock appreciation rights and options, shares			16
Restricted stock units, shares					0
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							(40)		$ (18)
Exercise of stock appreciation rights and options												$ (130)
Restricted stock units														$ (16)
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	(170)		$ (34)
Compensation expense						2,796	$ 381									2,796	$ 381
Stockholders' Equity, Other Shares		10
Other						(267)				17	268					18
Ending balance, shares at Mar. 31, 2022		38,444
Ending balance at Mar. 31, 2022	$ 1,098,394	$ 10,000				$ 183,100				$ 1,446,847	$ (470,697)				$ (70,856)	$ 1,098,394