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Stock Option Activity (Detail) - $ / shares
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of Shares, Outstanding Options at Beginning of Year 1,817,763 1,665,565 2,788,999
Number of Shares, Granted 202,364 318,572 297,151
Number of Shares, Exercised (677,566) (137,874) (151,085)
Number of Shares, Cancelled (19,182) (28,500) (1,269,500)
Number of Shares, Outstanding Options at End of Year 1,323,379 1,817,763 1,665,565
Number of Shares, Options Exercisable at End of Year 874,116 1,285,412 1,035,166
Weighted Average Fair Value of Options Granted during the Year $ 25.22 $ 24.27 $ 32.31
Weighted-Average Exercise Price, Outstanding Options at Beginning of Year 53.03 46.37 41.83
Weighted-Average Exercise Price, Granted 77.76 79.83 86.41
Weighted-Average Exercise Price, Exercised 34.46 27.58 32.38
Weighted-Average Exercise Price, Cancelled 70.30 86.35 47.43
Weighted-Average Exercise Price, Outstanding Options at End of Year $ 66.07 $ 53.03 $ 46.37