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Stock Option Activity (Detail) - $ / shares
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of Shares, Outstanding Options at Beginning of Year 1,665,565 2,788,999 3,022,592
Number of Shares, Granted 318,572 297,151 256,989
Number of Shares, Exercised (137,874) (151,085) (485,582)
Number of Shares, Cancelled (28,500) (1,269,500) (5,000)
Number of Shares, Outstanding Options at End of Year 1,817,763 1,665,565 2,788,999
Number of Shares, Options Exercisable at End of Year 1,285,412 1,035,166 818,215
Weighted-Average Exercise Price, Outstanding Options at Beginning of year $ 46.37 $ 41.83 $ 37.83
Weighted-Average Exercise Price, Granted 79.83 86.41 68.00
Weighted-Average Exercise Price, Exercised 27.58 32.38 29.72
Weighted-Average Exercise Price, Cancelled 86.35 47.43 53.22
Weighted-Average Exercise Price, Outstanding Options at End of Year 53.03 46.37 41.83
Weighted-Average Exercise Price, Weighted-Average Fair Value of Options Granted during the Year $ 24.27 $ 32.31 $ 26.35