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Stock-Based Compensation - Changes in Stock Options (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Changes in stock options  
Options outstanding, Beginning of Period | shares 2,547,809
Options, Granted | shares 0
Options, Exercised | shares (637,769)
Options, Lapsed and Forfeited | shares (183,249)
Options outstanding, End of Period | shares 1,726,791
Options vested and expected to vest, June 30, 2016 | shares 1,713,555
Options exercisable, June 30, 2016 | shares 1,260,230
Weighted Average Exercise Price, Options outstanding, Beginning of Period | $ / shares $ 33.72
Weighted Average Exercise Price, Granted | $ / shares 0.00
Weighted Average Exercise Price, Exercised | $ / shares 33.44
Weighted Average Exercise Price, Lapsed and Forfeited | $ / shares 31.29
Weighted Average Exercise Price, Options outstanding, End of Period | $ / shares 34.08
Weighted Average Exercise Price, Option vested and expected to vest, June 30, 2016 | $ / shares 34.12
Weighted Average Exercise Price, Options exercisable, June 30, 2016 | $ / shares $ 35.76
Weighted Average Remaining Life, Options outstanding, June 30, 2016 4 years 8 months 7 days
Weighted Average Remaining Life, Options vested and expected to vest, June 30, 2016 4 years 7 months 24 days
Weighted Average Remaining Life, Options exercisable, June 30, 2016 3 years 5 months 11 days
Aggregate Intrinsic value, Options outstanding, June 30, 2016 | $ $ 9,296
Aggregate Intrinsic Value, Options vested and expected to vest, June 30, 2016 | $ 9,173
Aggregate Intrinsic Value, Options exercisable, June 30, 2016 | $ $ 5,231