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Summary of Stock Option Activity (Detail) - Stock Option Awards
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Options outstanding, shares  
Beginning Balance | shares 1,463
Granted | shares 103
Exercised | shares (21)
Forfeited/Expired | shares (64)
Ending Balance | shares 1,481
Exercisable as of June 30, 2018 | shares 724
Expected to vest as of June 30, 2018 | shares 757
Total | shares 1,481
Weighted Average Exercise Price Per Share  
Beginning Balance | $ / shares $ 140.83
Granted | $ / shares 128.27
Exercised | $ / shares 121.13
Forfeited/Expired | $ / shares 163.25
Ending Balance | $ / shares 139.26
Exercisable as of June 30, 2018 | $ / shares 137.07
Expected to vest as of June 30, 2018 | $ / shares 141.36
Total | $ / shares $ 139.26
Aggregate Intrinsic Value  
Exercised | $ $ 196
Exercisable as of June 30, 2018 | $ 3,316
Expected to vest as of June 30, 2018 | $ 19
Total | $ $ 3,335
Weighted Average Remaining Contractual Term (Years)  
Exercisable as of June 30, 2018 5 years 8 months 12 days
Expected to vest as of June 30, 2018 9 years 3 months 18 days
Total 7 years 6 months