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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, 2019
USD ($)
$ / shares
shares
Options outstanding, shares  
Beginning Balance | shares 1,460
Granted | shares 23
Exercised | shares (3)
Forfeited/Expired | shares (21)
Ending Balance | shares 1,459
Exercisable as of June 30, 2019 | shares 842
Expected to vest as of June 30, 2019 | shares 617
Total | shares 1,459
Weighted Average Exercise Price Per Share  
Beginning Balance | $ / shares $ 137.38
Granted | $ / shares 133.62
Exercised | $ / shares 131.53
Forfeited/Expired | $ / shares 156.14
Ending Balance | $ / shares 137.05
Exercisable as of June 30, 2019 | $ / shares 136.98
Expected to vest as of June 30, 2019 | $ / shares 137.15
Total | $ / shares $ 137.05
Aggregate Intrinsic Value  
Exercised | $ $ 38
Exercisable as of June 30, 2019 | $ 12,676
Expected to vest as of June 30, 2019 | $ 6,823
Total | $ $ 19,499
Weighted Average Remaining Contractual Term (Years)  
Exercisable as of June 30, 2019 5 years 9 months 18 days
Expected to vest as of June 30, 2019 8 years 8 months 12 days
Total 7 years