Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014
Options
Outstanding at April 1, 2014	3,492
Granted	256
Exercised	(67)
Cancelled and expired	(3)
Outstanding at June 30, 2014	3,678	3,492
Exercisable at June 30, 2014	2,938
Options vested and expected to vest at end of year	3,614
Weighted-Average Exercise Price
Outstanding at April 1, 2014	$ 13.27
Granted	$ 21.55
Exercised	$ 9.99
Cancelled and expired	$ 17.67
Outstanding at June 30, 2014	$ 13.90	$ 13.27
Exercisable at June 30, 2014	$ 11.93
Options vested and expected to vest at June 30, 2014	$ 13.78
Weighted-Average Remaining Contractual Term (years)
Outstanding	5 years 29 days	4 years 11 months 1 day
Exercisable at June 30, 2014	4 years 1 month 10 days
Options vested and expected to vest at June 30, 2014	5 years 4 days
Aggregate Intrinsic Value
Outstanding at June 30, 2014	$ 41,412
Exercisable at June 30, 2014	38,802
Options vested and expected to vest at June 30, 2014	$ 41,108