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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share, Basic and Diluted [Abstract]                      
Net income $ 61,345 $ 73,855 $ 72,098 $ 89,370 $ 60,993 $ 59,252 $ 68,089 $ 83,551 $ 296,668 $ 271,885 $ 365,034
Common share information:                      
Basic weighted average shares outstanding 76,615 76,683 76,879 76,972 77,060 77,177 77,216 77,188 76,787 77,160 77,252
Dilutive effect of stock options, restricted stock units, and restricted stock                 147 187 333
Diluted weighted average shares outstanding 76,849 76,884 76,935 77,067 77,157 77,286 77,409 77,537 76,934 77,347 77,585
Basic earnings per share $ 0.80 $ 0.96 $ 0.94 $ 1.16 $ 0.79 $ 0.77 $ 0.88 $ 1.08 $ 3.86 $ 3.52 $ 4.73
Diluted earnings per share $ 0.80 $ 0.96 $ 0.94 $ 1.16 $ 0.79 $ 0.77 $ 0.88 $ 1.08 $ 3.86 $ 3.52 $ 4.70
Antidilutive stock options and restricted stock excluded from computation of earnings per share                 2 0 41