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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Stock-based compensation expense $ 4.8 $ 4.5
Related tax benefits 1.8 1.7
Unrecognized compensation cost related to non-vested stock options 5.2  
Unrecognized compensation cost of restricted stock awards $ 20.2  
Amortization period of unrecognized compensation cost 3 years  
Amortization period of unrecognized compensation cost for restricted stock awards 1 year 3 months 18 days