CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash, Cash Equivalent and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 467,176	$ 338,489	$ 409,632	$ 369,821
Restricted cash	0	1,748	188	910
Total cash, cash equivalents and restricted cash	$ 467,176	$ 340,237	$ 409,820	$ 370,731