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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost of non vested stock options $ 7.1   $ 7.1  
Unrecognized compensation cost of restricted stock unit awards     30.4  
Amortization period of unrecognized compensation cost for non vested stock options     3 years 4 months 24 days  
Amortization period of unrecognized compensation cost for restricted stock unit awards     1 year 8 months 12 days  
Segment, Continuing Operations [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 8.2 7.8 21.1 21.6
Related tax benefits $ 3.0 $ 2.9 $ 7.9 $ 8.0