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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Stock-based compensation expense $ 8.4 $ 4.8
Related tax benefits 3.2 1.8
Unrecognized compensation cost related to non-vested stock options 12.0  
Unrecognized compensation cost of restricted stock awards $ 25.2  
Amortization period of unrecognized compensation cost for non-vested stock options 3 years 1 month 12 days  
Amortization period of unrecognized compensation cost for restricted stock awards 1 year 3 months 12 days