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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, 2021
USD ($)
$ / shares
shares
Options outstanding, shares  
Beginning Balance | shares 1,273
Granted | shares 20
Exercised | shares (2)
Forfeited/Expired | shares (11)
Ending Balance | shares 1,280
Exercisable as of June 30, 2021 | shares 587
Expected to vest as of June 30, 2021 | shares 693
Total | shares 1,280
Weighted Average Exercise Price Per Share  
Beginning Balance | $ / shares $ 259.39
Granted | $ / shares 470.00
Exercised | $ / shares 129.90
Forfeited/Expired | $ / shares 504.66
Ending Balance | $ / shares 260.71
Exercisable as of June 30, 2021 | $ / shares 132.35
Expected to vest as of June 30, 2021 | $ / shares 369.48
Total | $ / shares $ 260.71
Aggregate Intrinsic Value  
Exercised | $ $ 643
Exercisable as of June 30, 2021 | $ 312,395
Expected to vest as of June 30, 2021 | $ 211,992
Total | $ $ 524,387
Weighted Average Remaining Contractual Term (Years)  
Exercisable as of June 30, 2021 3 years 9 months 18 days
Expected to vest as of June 30, 2021 8 years 10 months 24 days
Total 6 years 6 months