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Share-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2019
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Intrinsic value, exercises in period $ 2,923  
Options    
Outstanding at beginning of the period (shares) 8,973,000  
Granted (shares) 1,101,000  
Exercised (shares) (659,000)  
Cancelled (shares) (9,000)  
Forfeited (shares) (421,000)  
Expired (shares) 0  
Outstanding at end of the period (shares) 8,985,000 8,973,000
Options exercisable (shares) 6,352,000  
Options vested and expected to vest (shares) 8,857,000  
Weighted Average Exercise Price/Share    
Weighted average exercise price, outstanding, beginning balance (in dollars per share) $ 7.57  
Weighted average exercise price, granted (in dollars per share) 12.74  
Weighted average exercise price, exercised (in dollars per share) 5.40  
Weighted average exercise price, cancelled (in dollars per share) 20.88  
Weighted average exercise price, forfeited (in dollars per share) 12.91  
Weighted average exercise price, expired (in dollars per share) 0  
Weighted average exercise price, outstanding, ending balance (in dollars per share) 8.15 $ 7.57
Weighted average exercise price, exercisable (in dollars per share) 5.66  
Weighted average exercise price, options vested and expected to vest (in dollars per share) $ 8.07  
Weighted Average Remaining Contractual Term    
Weighted average remaining contractual term, outstanding 6 years 9 months 6 years 11 months
Weighted average contractual term, exercisable 5 years 9 months  
Weighted average remaining contractual term, options vested and expected to vest 6 years 8 months  
Intrinsic value, outstanding $ 49,875 $ 95,864
Intrinsic value, exercisable 46,378  
Intrinsic value, options vested and expected to vest $ 49,847