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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2015
May. 31, 2015
May. 31, 2014
Mar. 31, 2014
May. 31, 2013
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Aug. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation           $ 10,793   $ 4,024 $ 15,592 $ 8,314  
Aggregate intrinsic value of options exercised in period                 49,500    
Fair value of options vested in period                 $ 2,400    
Weighted average grant-date fair value for options granted                 $ 18.08 $ 9.05  
Chief Financial Officer                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Employment retirement date                 Jul. 31, 2015    
Stock-based compensation           2,500     $ 2,500    
Consultant service ending date                 Jul. 31, 2017    
Stock Options                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation           2,227   $ 624 $ 3,046 $ 1,423  
Unrecognized stock-based compensation expense           $ 6,400     $ 6,400    
Unrecognized stock-based compensation expense, weighted-average recognition period                 2 years 3 months 18 days    
Expected dividend yield                 0.00%    
Performance Based Restricted Stock Units                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted share unit issued   183,940 379,752   268,988            
Non-vested shares, outstanding           222,563   148,995 222,563 148,995  
Shares of award granted, it is probable that the prescribed performance targets will be met       50,000              
Reversal, Share based compensation             $ 1,000        
Restricted stock units                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation           $ 8,446   $ 3,334 $ 12,349 $ 6,754  
Years of service 5 years                    
Non-employee director retirement age 65 years                    
Unrecognized stock-based compensation expense           33,300     $ 33,300    
Unrecognized stock-based compensation expense, weighted-average recognition period                 2 years 9 months 18 days    
Expected dividend yield                 0.00%    
Weighted average grant-date fair value for restricted stock and restricted stock units granted                 $ 80.70 $ 21.88  
Fair value of restricted stock and restricted stock units vested in period                 $ 10,200 $ 9,500  
Restricted stock units | Non-employee directors                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation           $ 2,000 $ 1,400   $ 2,000    
Equity award, restricted stocks available for grant                     3,900
Equity award, vesting options                 Vest on the earlier of (a) the one year anniversary of the grant date; or (b) the next annual meeting of stockholders.    
Market Based Restricted Stock Units                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Weighted average grant-date fair value for restricted stock and restricted stock units granted                 $ 107.10    
Restricted share unit issued                 322,980    
Market Based Restricted Stock Units | Executive Office                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted share unit issued 322,980                    
Market Based Restricted Stock Units | Minimum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Share earning           0.00%     0.00%    
Market Based Restricted Stock Units | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Share earning           300.00%     300.00%    
Performance and Market-Based Restricted Stock Units                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Unrecognized stock-based compensation expense           $ 22,700     $ 22,700    
Unrecognized stock-based compensation expense, weighted-average recognition period                 3 years