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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Stock-based compensation expense $ 9.9 $ 8.4 $ 14.7 $ 12.9
Related tax benefits 3.7 3.2 5.5 4.9
Unrecognized compensation cost related to non-vested stock options 4.1   4.1  
Unrecognized compensation cost of restricted stock awards     $ 40.0  
Amortization period of unrecognized compensation cost for non-vested stock options     3 years  
Amortization period of unrecognized compensation cost for restricted stock awards     1 year 9 months 18 days