Revenue Recognition - Schedule of Disaggregated Revenue by Major Business Line (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Table]
Total revenue	$ 248,142	$ 209,764	$ 500,727	$ 374,614
U S [Member]
Disaggregation Of Revenue [Table]
Total revenue	200,485	172,147	407,628	306,872
Europe [Member]
Disaggregation Of Revenue [Table]
Total revenue	32,527	25,350	64,764	45,008
Japan [Member]
Disaggregation Of Revenue [Table]
Total revenue	12,267	10,311	23,551	19,296
Rest of world [Member]
Disaggregation Of Revenue [Table]
Total revenue	2,863	1,956	4,784	3,438
Product
Disaggregation Of Revenue [Table]
Total revenue	235,785	199,676	477,259	355,093
Service and Other
Disaggregation Of Revenue [Table]
Total revenue	$ 12,357	$ 10,088	$ 23,468	$ 19,521