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Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Options outstanding, shares  
Beginning Balance | shares 896
Granted | shares 45
Exercised | shares (6)
Forfeited/Expired | shares 0
Ending Balance | shares 935
Exercisable as of June 30, 2016 | shares 312
Expected to vest as of June 30, 2016 | shares 623
Total | shares 935
Weighted Average Exercise Price Per Share  
Beginning Balance | $ / shares $ 144.13
Granted | $ / shares 189.62
Exercised | $ / shares 146.61
Forfeited/Expired | $ / shares 0.00
Ending Balance | $ / shares 146.31
Exercisable as of June 30, 2016 | $ / shares 128.45
Expected to vest as of June 30, 2016 | $ / shares 155.27
Total | $ / shares $ 146.31
Aggregate Intrinsic Value  
Exercised | $ $ 241
Exercisable as of June 30, 2016 | $ 14,578
Expected to vest as of June 30, 2016 | $ 16,430
Total | $ $ 31,008
Weighted Average Remaining Contractual Term (Years)  
Exercisable as of June 30, 2016 8 years
Expected to vest as of June 30, 2016 8 years 6 months
Total 8 years 3 months 18 days