Basis of Presentation - Summary of Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Accounting Policies [Abstract]
Unbilled accounts receivable	$ 82,827	$ 75,661
Collections in excess of revenues and deferred revenues	128,079	123,019
Deferred revenues, long-term portion	$ 91,260	$ 80,802