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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Accounting Policies [Abstract]        
Cash and cash equivalents $ 846,851 $ 380,373    
Restricted cash (1) 373 373    
Total cash, cash equivalents, and restricted cash $ 847,224 $ 380,746 $ 286,115 $ 300,223