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Stock-Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Stock Options
Sep. 30, 2013
Stock Options
Sep. 30, 2014
Stock Options
Sep. 30, 2013
Stock Options
Sep. 30, 2014
Restricted Stock and Restricted Stock Units
Sep. 30, 2013
Restricted Stock and Restricted Stock Units
Jun. 30, 2011
Performance Based Restricted Stock and Restricted Stock Units
May 31, 2011
Performance Based Restricted Stock and Restricted Stock Units
Sep. 30, 2014
Performance Based Restricted Stock and Restricted Stock Units
Sep. 30, 2014
Performance Based Restricted Stock and Restricted Stock Units
May 31, 2014
Performance Based Restricted Stock and Restricted Stock Units
Share Based Awards
May 31, 2013
Performance Based Restricted Stock and Restricted Stock Units
Share Based Awards
May 31, 2012
Performance Based Restricted Stock and Restricted Stock Units
Share Based Awards
Sep. 30, 2014
Performance Based Restricted Stock and Restricted Stock Units
Share Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Aggregate intrinsic value of options exercised in period     $ 3,000,000                              
Fair value of options vested in period     1,700,000                              
Unrecognized stock-based compensation expense         5,700,000   5,700,000   17,000,000       8,000,000 8,000,000        
Unrecognized stock-based compensation expense, weighted-average recognition period             2 years 6 months   2 years       1 year 9 months 18 days          
Weighted average grant-date fair value for options granted     $ 9.05 $ 9.67                            
Expected dividend yield     0.00%                              
Weighted average grant-date fair value for restricted stock and restricted stock units granted                 $ 21.88 $ 23.18                
Fair value of restricted stock and restricted stock units vested in period                 9,500,000 6,000,000                
Shares of award granted                 664,000   284,000 284,000     379,752 268,988 195,188  
Shares of award vested                 465,000                 154,991
Shares of award granted, performance target met                           234,000        
Shares of award granted, it is probable that the prescribed performance targets will be met                           50,000        
Stock-based compensation $ 4,024,000 $ 2,798,000 $ 8,314,000 $ 6,719,000 $ 624,000 $ 598,000 $ 1,423,000 $ 1,523,000         $ 2,100,000 $ 3,700,000