Condensed Statements of Shareholder's Equity Condensed Statements of Shareholders' Equity (Unaudited) - USD ($) shares 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, 2019		38,597
Beginning balance at Jun. 30, 2019		$ 10,000,000				$ 172,931,000				$ 1,229,148,000	$ (415,159,000)				$ (99,886,000)	$ 897,034,000
Net income	$ 38,799,000															38,799,000
Other comprehensive (loss) income	(5,247,000)														(5,247,000)	(5,247,000)
Cash dividends										(20,000)						(20,000)
Exercise of stock appreciation rights and options, shares			5
Performance share awards, shares				36
Restricted stock units, shares					16
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units							$ (177,000)	$ (1,540,000)	$ (631,000)
Exercise of stock appreciation rights and options												$ (61,000)
Performance share awards													$ (362,000)
Restricted stock units														$ 200,000
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	$ (116,000)	$ (1,178,000)	$ (431,000)
Compensation expense						919,000	773,000									919,000	773,000
Stockholders' Equity, Other Shares		2
Other						(52,000)				(4,000)	23,000					(33,000)
Other | Adjustments for New Accounting Pronouncement [Member]										(3,275,000)						(3,275,000)
Ending balance, shares at Sep. 30, 2019		38,656
Ending balance at Sep. 30, 2019		$ 10,000,000				172,223,000				1,264,648,000	(414,513,000)				(105,133,000)	927,225,000
Beginning balance, shares at Jun. 30, 2020		38,710
Beginning balance at Jun. 30, 2020	843,542,000	$ 10,000,000				176,492,000				1,200,570,000	(414,090,000)				(129,430,000)	843,542,000
Net income	34,784,000															34,784,000
Other comprehensive (loss) income	7,509,000														7,509,000	7,509,000
Cash dividends										(18,000)						(18,000)
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							(277,000)	$ (985,000)	$ (593,000)
Exercise of stock appreciation rights and options												$ (12,000)
Performance share awards													$ (20,000)
Restricted stock units														$ 96,000
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units																	(265,000)	$ (1,005,000)	$ (497,000)
Compensation expense						677,000	$ 693,000									677,000	$ 693,000
Other										15,000	(29,000)					(14,000)
Ending balance, shares at Sep. 30, 2020		38,760
Ending balance at Sep. 30, 2020	$ 885,406,000	$ 10,000,000				$ 176,007,000				$ 1,235,351,000	$ (414,031,000)				$ (121,921,000)	$ 885,406,000