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Condensed Statements of Shareholder's Equity Condensed Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [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]
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Beginning balance, shares at Jun. 30, 2017 |  | 39,041 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2017 |  | $ 10,000 | $ 164,655 |  |  |  | $ 1,033,751 | $ (381,448) |  |  |  | $ (81,702) | $ 745,256 |  |  |
Net income | $ 33,721 |  |  |  |  |  |  |  |  |  |  |  | 33,721 |  |  |
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  |  |  |  | 8,152 | 8,152 |  |  |
Cash dividends |  |  |  |  |  |  | (2) |  |  |  |  |  | (2) |  |  |
Purchases of common stock for treasury, shares |  | (248) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of common stock for treasury |  |  |  |  |  |  |  | (13,761) |  |  |  |  | (13,761) |  |  |
Exercise of stock appreciation rights and options, shares |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units |  |  |  | $ (80) | $ (273) | $ (616) |  |  |  |  |  |  |  |  |  |
Exercise of stock appreciation rights and options |  |  |  |  |  |  |  |  | $ 14 |  |  |  |  |  |  |
Performance share awards, shares |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance share awards |  |  |  |  |  |  |  |  |  | $ (24) |  |  |  |  |  |
Restricted stock units, shares |  | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  | $ (57) |  |  |  |  |
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (66) | $ (297) | $ (673)
Compensation expense |  |  | 778 | 577 |  |  |  |  |  |  |  |  | 778 | 577 |  |
Other, shares |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  | (43) |  |  |  | 3 | 23 |  |  |  |  | (17) |  |  |
Ending balance, shares at Sep. 30, 2017 |  | 38,814 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2017 |  | $ 10,000 | 164,998 |  |  |  | 1,067,473 | (395,253) |  |  |  | (73,550) | 773,668 |  |  |
Beginning balance, shares at Jun. 30, 2017 |  | 39,041 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2017 |  | $ 10,000 | 164,655 |  |  |  | 1,033,751 | (381,448) |  |  |  | (81,702) | 745,256 |  |  |
Net income | 101,263 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive (loss) income, net of tax | 1,702 |  |  |  |  |  |  |  |  |  |  | 1,702 |  |  |  |
Ending balance, shares at Mar. 31, 2018 |  | 38,696 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2018 |  | $ 10,000 | 167,848 |  |  |  | 1,112,136 | (403,956) |  |  |  | (80,000) | 806,028 |  |  |
Beginning balance, shares at Sep. 30, 2017 |  | 38,814 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Sep. 30, 2017 |  | $ 10,000 | 164,998 |  |  |  | 1,067,473 | (395,253) |  |  |  | (73,550) | 773,668 |  |  |
Net income | 30,950 |  |  |  |  |  |  |  |  |  |  |  | 30,950 |  |  |
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  |  |  |  | (6,064) | (6,064) |  |  |
Cash dividends |  |  |  |  |  |  | (11,246) |  |  |  |  |  | (11,246) |  |  |
Purchases of common stock for treasury, shares |  | (145) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of common stock for treasury |  |  |  |  |  |  |  | (9,017) |  |  |  |  | (9,017) |  |  |
Exercise of stock appreciation rights and options, shares |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units |  |  |  | (171) |  | (54) |  |  |  |  |  |  |  |  |  |
Exercise of stock appreciation rights and options |  |  |  |  |  |  |  |  | (26) |  |  |  |  |  |  |
Restricted stock units, shares |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  | (197) |  | (46)
Compensation expense |  |  | 799 | 436 |  |  |  |  |  |  |  |  | 799 | 436 |  |
Other |  |  |  |  |  |  | (21) |  |  |  |  |  | (21) |  |  |
Ending balance, shares at Dec. 31, 2017 |  | 38,674 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2017 |  | $ 10,000 | 166,008 |  |  |  | 1,087,156 | (404,288) |  |  |  | (79,614) | 779,262 |  |  |
Net income | 36,592 |  |  |  |  |  |  |  |  |  |  |  | 36,592 |  |  |
Other comprehensive (loss) income, net of tax | $ (386) |  |  |  |  |  |  |  |  |  |  | (386) | (386) |  |  |
Cash dividends |  |  |  |  |  |  | (11,637) |  |  |  |  |  | (11,637) |  |  |
Exercise of stock appreciation rights and options, shares |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units |  |  |  | (169) |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock appreciation rights and options |  |  |  |  |  |  |  |  | (18) |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  | (3) |  |  |  |  |
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  | (187) |  | (3)
Compensation expense |  |  | 1,904 | 466 |  |  |  |  |  |  |  |  | 1,904 | 466 |  |
Other, shares |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  | (361) |  |  |  | 25 | 353 |  |  |  |  | 17 |  |  |
Ending balance, shares at Mar. 31, 2018 |  | 38,696 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2018 |  | $ 10,000 | 167,848 |  |  |  | 1,112,136 | (403,956) |  |  |  | (80,000) | 806,028 |  |  |
Beginning balance, shares at Jun. 30, 2018 | 38,703 | 38,703 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2018 | $ 814,963 | $ 10,000 | 169,383 |  |  |  | 1,129,678 | (403,875) |  |  |  | (90,223) | 814,963 |  |  |
Net income | $ 48,938 |  |  |  |  |  |  |  |  |  |  |  | 48,938 |  |  |
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  |  |  |  | 5,347 | 5,347 |  |  |
Cumulative effect of adopting accounting standards | Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |  | 3,056 |  |  |  |  |  | 3,056 |  |  |
Cash dividends |  |  |  |  |  |  | (13) |  |  |  |  |  | (13) |  |  |
Exercise of stock appreciation rights and options, shares |  | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units |  |  |  | (855) | $ (844) | (760) |  |  |  |  |  |  |  |  |  |
Exercise of stock appreciation rights and options |  |  |  |  |  |  |  |  | (210) |  |  |  |  |  |  |
Performance share awards, shares |  | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance share awards |  |  |  |  |  |  |  |  |  | $ (301) |  |  |  |  |  |
Restricted stock units, shares |  | 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  | (198) |  |  |  |  |
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,065) | $ (1,145) | (958)
Compensation expense |  |  | 1,043 | 651 |  |  |  |  |  |  |  |  | 1,043 | 651 |  |
Other |  |  |  |  |  |  | 24 | (35) |  |  |  |  | (11) |  |  |
Ending balance, shares at Sep. 30, 2018 |  | 38,754 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2018 |  | $ 10,000 | 168,618 |  |  |  | 1,181,683 | (404,619) |  |  |  | (84,876) | 870,806 |  |  |
Beginning balance, shares at Jun. 30, 2018 | 38,703 | 38,703 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2018 | $ 814,963 | $ 10,000 | 169,383 |  |  |  | 1,129,678 | (403,875) |  |  |  | (90,223) | 814,963 |  |  |
Net income | 104,190 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive (loss) income, net of tax | $ (6,771) |  |  |  |  |  |  |  |  |  |  | (6,771) |  |  |  |
Ending balance, shares at Mar. 31, 2019 | 38,593 | 38,593 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2019 | $ 882,848 | $ 10,000 | 171,734 |  |  |  | 1,213,314 | (415,206) |  |  |  | (96,994) | 882,848 |  |  |
Beginning balance, shares at Sep. 30, 2018 |  | 38,754 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Sep. 30, 2018 |  | $ 10,000 | 168,618 |  |  |  | 1,181,683 | (404,619) |  |  |  | (84,876) | 870,806 |  |  |
Net income | 38,717 |  |  |  |  |  |  |  |  |  |  |  | 38,717 |  |  |
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  |  |  |  | (9,756) | (9,756) |  |  |
Cash dividends |  |  |  |  |  |  | (11,651) |  |  |  |  |  | (11,651) |  |  |
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units |  |  |  | (7) |  | $ (140) |  |  |  |  |  |  |  |  |  |
Exercise of stock appreciation rights and options |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Restricted stock units, shares |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  | $ 31 |  |  |  |  |
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  | (6) |  | $ (109)
Compensation expense |  |  | 1,308 | 606 |  |  |  |  |  |  |  |  | 1,308 | 606 |  |
Other |  |  |  |  |  |  | (1) | 1 |  |  |  |  | 0 |  |  |
Ending balance, shares at Dec. 31, 2018 |  | 38,757 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 |  | $ 10,000 | 170,385 |  |  |  | 1,208,748 | (404,586) |  |  |  | (94,632) | 889,915 |  |  |
Net income | 16,535 |  |  |  |  |  |  |  |  |  |  |  | 16,535 |  |  |
Other comprehensive (loss) income, net of tax | $ (2,362) |  |  |  |  |  |  |  |  |  |  | (2,362) | (2,362) |  |  |
Cash dividends |  |  |  |  |  |  | (11,979) |  |  |  |  |  | (11,979) |  |  |
Purchases of common stock for treasury, shares |  | (192) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of common stock for treasury |  |  |  |  |  |  |  | (11,158) |  |  |  |  | (11,158) |  |  |
Exercise of stock appreciation rights and options, shares |  | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Paid in Capital, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units |  |  |  | (197) |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock appreciation rights and options |  |  |  |  |  |  |  |  | $ 149 |  |  |  |  |  |  |
Total Shareholders' Equity, Exercise of stock appreciation rights and options, Performance share awards, Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  | (48) |  |
Compensation expense |  |  | 1,365 | $ 574 |  |  |  |  |  |  |  |  | 1,365 | $ 574 |  |
Other, shares |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  | (393) |  |  |  | 10 | 389 |  |  |  |  | 6 |  |  |
Ending balance, shares at Mar. 31, 2019 | 38,593 | 38,593 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2019 | $ 882,848 | $ 10,000 | $ 171,734 |  |  |  | $ 1,213,314 | $ (415,206) |  |  |  | $ (96,994) | $ 882,848 |  |  |

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