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Stock-Based Compensation - Stock Option Activity (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Stock options activity    
Outstanding, beginning of period (in shares) 1,369,442  
Granted (in shares) 262,471  
Exercised (in shares) (90,009)  
Cancelled / Forfeited (in shares) (60,815)  
Outstanding, end of period (in shares) 1,481,089 1,369,442
Vested and exercisable, end of period (in shares) 781,669  
Vested and expected to vest, end of period (in shares) 1,419,308  
Weighted Average Exercise Price    
Outstanding, beginning of period (in dollars per share) $ 45.93  
Granted (in dollars per share) 115.37  
Exercised (in dollars per share) 41.23  
Cancelled / Forfeited (in dollars per share) 65.87  
Outstanding, end of period (in dollars per share) 57.70 $ 45.93
Vested and exercisable, end of period (in dollars per share) 42.13  
Vested and expected to vest, end of period (in dollars per share) $ 57.03  
Weighted Average Remaining Contractual Term    
Outstanding, end of period 7 years 5 months 17 days 7 years 2 months 23 days
Vested and exercisable, end of period 6 years 2 months 7 days  
Vested and expected to vest, end of period 7 years 4 months 25 days  
Aggregate Intrinsic Value    
Outstanding, end of period $ 83,612 $ 64,103
Vested and exercisable, end of period 56,144  
Vested and expected to vest, end of period $ 81,071