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Stock-Based Compensation - Summary of Incentive Equity Awards (Detail) (USD $)
3 Months Ended 9 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Time-based Restricted Stock Units [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options, Beginning balance 2,996,894 2,025,569
Number of Options, Granted 15,937 1,076,619
Number of Options, Vesting of restricted stock units (50,775) (56,944)
Number of Options, Expired/forfeited (26,894) (110,082)
Number of Options, Ending balance 2,935,162 2,935,162
Weighted- Average Grant Date Fair Value, Beginning balance $ 20.18 $ 19.61
Weighted- Average Grant Date Fair Value, Granted $ 20.66 $ 21.23
Weighted- Average Grant Date Fair Value, Vesting of restricted stock units $ 21.53 $ 21.37
Weighted- Average Grant Date Fair Value, Expired/forfeited $ 19.96 $ 19.92
Weighted- Average Grant Date Fair Value, Ending balance $ 20.16 $ 20.16
Performance-based Restricted Stock Units [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options, Beginning balance 823,277 703,195
Number of Options, Granted   246,894
Number of Options, Vesting of restricted stock units (1,713) (11,393)
Number of Options, Expired/forfeited (703) (117,835)
Number of Options, Ending balance 820,861 820,861
Weighted- Average Grant Date Fair Value, Beginning balance $ 20.47 $ 20.39
Weighted- Average Grant Date Fair Value, Granted   $ 21.25
Weighted- Average Grant Date Fair Value, Vesting of restricted stock units $ 21.64 $ 23.05
Weighted- Average Grant Date Fair Value, Expired/forfeited $ 23.25 $ 21.42
Weighted- Average Grant Date Fair Value, Ending balance $ 20.46 $ 20.46
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options, Beginning balance 11,493,407 12,381,488
Number of Options, Granted 1,295,750 1,413,341
Number of Options, Exercise of stock options (572,681) (1,487,702)
Number of Options, Expired/forfeited (69,881) (160,532)
Number of Options, Ending balance 12,146,595 12,146,595
Weighted- Average Exercise Price, Beginning balance $ 19.66 $ 19.42
Weighted- Average Exercise Price, Granted $ 22.27 $ 22.30
Weighted- Average Exercise Price, Exercise of stock options $ 16.64 $ 16.80
Weighted- Average Exercise Price, Expired/forfeited $ 19.93 $ 19.32
Weighted- Average Exercise Price, Ending balance $ 20.08 $ 20.08