Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016
Options
Outstanding at beginning of period	2,244
Granted	110
Exercised	(197)
Cancelled and expired	(3)
Outstanding at end of period	2,154	2,244
Exercisable at end of period	1,657
Options vested and expected to vest at end of period	2,100
Weighted-Average Exercise Price
Outstanding at beginning of period	$ 20.55
Granted	99.65
Exercised	14.10
Cancelled and expired	46.63
Outstanding at end of period	25.12	$ 20.55
Exercisable at end of period	16.00
Options vested and expected to vest at end of period	$ 24.53
Weighted-Average Remaining Contractual Term (years)
Outstanding	5 years 5 months 1 day	5 years 2 months 9 days
Exercisable at end of period	4 years 5 months 23 days
Options vested and expected to vest at end of period	5 years 4 months 2 days
Aggregate Intrinsic Value
Outstanding at end of period	$ 181,299
Exercisable at end of period	154,565
Options vested and expected to vest at end of period	$ 178,007