Summary of Stock Option Activity (Detail) - Stock Option Awards $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares
Options outstanding, shares
Beginning Balance | shares	1,601
Granted | shares	20
Exercised | shares	(12)
Forfeited/Expired | shares	(128)
Ending Balance | shares	1,481
Exercisable as of June 30, 2020 | shares	910
Expected to vest as of June 30, 2020 | shares	571
Total | shares	1,481
Weighted Average Exercise Price Per Share
Beginning Balance | $ / shares	$ 141.41
Granted | $ / shares	124.48
Exercised | $ / shares	127.93
Forfeited/Expired | $ / shares	146.13
Ending Balance | $ / shares	140.88
Exercisable as of June 30, 2020 | $ / shares	138.40
Expected to vest as of June 30, 2020 | $ / shares	144.82
Total | $ / shares	$ 140.88
Aggregate Intrinsic Value
Exercised | $	$ 24
Exercisable as of June 30, 2020 | $	0
Expected to vest as of June 30, 2020 | $	0
Total | $	$ 0
Weighted Average Remaining Contractual Term (Years)
Exercisable as of June 30, 2020	4 years 10 months 24 days
Expected to vest as of June 30, 2020	8 years 9 months 18 days
Total	6 years 4 months 24 days