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Stock-Based Compensation - Changes in Stock Options (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Changes in stock options  
Options outstanding, Beginning of Period | shares 1,726,791
Options, Granted | shares 0
Options, Exercised | shares (625,503)
Options, Lapsed and Forfeited | shares (111,296)
Options outstanding, End of Period | shares 989,992
Options vested and expected to vest, June 30, 2018 | shares 989,992
Options exercisable, June 30, 2018 | shares 812,159
Weighted Average Exercise Price, Options outstanding, Beginning of Period | $ / shares $ 34.08
Weighted Average Exercise Price, Granted | $ / shares 0.00
Weighted Average Exercise Price, Exercised | $ / shares 35.54
Weighted Average Exercise Price, Lapsed and Forfeited | $ / shares 34.68
Weighted Average Exercise Price, Options outstanding, End of Period | $ / shares 33.08
Weighted Average Exercise Price, Option vested and expected to vest, June 30, 2018 | $ / shares 33.08
Weighted Average Exercise Price, Options exercisable, June 30, 2018 | $ / shares $ 33.97
Weighted Average Remaining Life, Options outstanding, June 30, 2018 5 years 1 month
Weighted Average Remaining Life, Options vested and expected to vest, June 30, 2018 5 years 1 month
Weighted Average Remaining Life, Options exercisable, June 30, 2018 4 years 7 months
Aggregate Intrinsic value, Options outstanding, June 30, 2018 | $ $ 5,170
Aggregate Intrinsic Value, Options vested and expected to vest, June 30, 2018 | $ 5,170
Aggregate Intrinsic Value, Options exercisable, June 30, 2018 | $ $ 3,851