Revenue Recognition - Schedule of Deferred Revenues Balance as of Transition Date and Significant Activity Affecting Deferred Revenues (Detail)	12 Months Ended
	Mar. 31, 2021 USD ($)
Change In Contract With Customer Liability [Abstract]
Beginning balance at April 1, 2020	$ 17,645,000
Additions	37,970,000
Revenue recognized from beginning of period	(8,844,000)
Revenue recognized from additions	(24,257,000)
Ending balance at March 31, 2021	$ 22,514,000