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Stock-Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2011
Performance Based Restricted Stock and Restricted Stock Units
May 31, 2011
Performance Based Restricted Stock and Restricted Stock Units
Sep. 30, 2013
Performance Based Restricted Stock and Restricted Stock Units
Sep. 30, 2013
Performance Based Restricted Stock and Restricted Stock Units
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, 2013
Stock Options
Sep. 30, 2013
Restricted Stock and Restricted Stock Units
Sep. 30, 2012
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Aggregate intrinsic value of options exercised in period     $ 8,600,000                    
Fair value of options vested in period     2,200,000                    
Unrecognized stock-based compensation expense             5,800,000 5,800,000     5,400,000 13,800,000  
Unrecognized stock-based compensation expense, weighted-average recognition period               2 years 1 month 6 days     2 years 10 months 24 days 2 years 1 month 6 days  
Weighted average grant-date fair value for options granted     $ 9.67 $ 10.12                  
Expected dividend yield     0.00%                    
Weighted average grant-date fair value for restricted stock and restricted stock units granted                       $ 23.18 $ 22.32
Fair value of restricted stock and restricted stock units vested in period                       6,000,000 3,000,000
Shares of award granted         284,000 284,000     268,988 195,188   553,000  
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 $ 2,798,000 $ 2,284,000 $ 6,719,000 $ 4,963,000     $ 1,100,000 $ 2,800,000