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Stock-Based Compensation - Changes in Stock Options (Details)
 9 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Changes in stock options  
Options outstanding, June 30, 2017 | shares 1,726,791
Options, Granted | shares 0
Options, Exercised | shares (609,230)
Options, Lapsed or Forfeited | shares (94,292)
Options outstanding, March 31, 2018 | shares 1,023,269
Options vested and expected to vest, March 31, 2018 | shares 1,020,522
Options exercisable, March 31, 2018 | shares 845,436
Weighted Average Exercise Price, Options outstanding, June 30, 2017 | $ / shares $ 34.08
Weighted Average Exercise Price, Granted | $ / shares 0.00
Weighted Average Exercise Price, Exercised | $ / shares 35.68
Weighted Average Exercise Price, Lapsed or Forfeited | $ / shares 34.06
Weighted Average Exercise Price, Options outstanding, March 31, 2018 | $ / shares 33.12
Weighted Average Exercise Price, Option vested and expected to vest, March 31, 2018 | $ / shares 33.13
Weighted Average Exercise Price, Options exercisable, March 31, 2018 | $ / shares $ 33.98
Weighted Average Remaining Life, Options outstanding, March 31, 2018 5 years 2 months
Weighted Average Remaining Life, Options vested and expected to vest, March 31, 2018 5 years 2 months
Weighted Average Remaining Life, Options exercisable, March 31, 2018 4 years 8 months
Aggregate Intrinsic value, Options outstanding, March 31, 2018 | $ $ 8,168,000
Aggregate Intrinsic Value, Options vested and expected to vest, March 31, 2018 | $ 8,141,000
Aggregate Intrinsic Value, Options exercisable, March 31, 2018 | $ $ 6,159,000