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Stock Option Activity (Detail) (USD $)
9 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding Options at Beginning of Period 3,241,322
Number of Shares, Granted 567,179
Number of Shares, Exercised (588,601)
Number of Shares, Cancelled (42,278)
Number of Shares, Outstanding Options at End of Period 3,177,622
Number of Shares, Options Exercisable at End of Period 1,106,824
Weighted-Average Exercise Price, Outstanding Options at Beginning of Period $ 36.11
Weighted-Average Exercise Price, Granted $ 34.48
Weighted-Average Exercise Price, Exercised $ 26.67
Weighted-Average Exercise Price, Cancelled $ 42.21
Weighted-Average Exercise Price, Outstanding Options at End of Period $ 37.48
Weighted-Average Exercise Price, Options Exercisable at End of Period $ 29.78
Weighted-Average Exercise Price, Weighted-Average Fair Value of Options Granted during the Period $ 13.22