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SUMMARY OF ACCOUNTING POLICIES - Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Accounting Policies [Abstract]    
Cash and bank balances $ 1,222,737 $ 1,019,802
Money market funds and time deposits 473,888 452,622
Cash and cash equivalents $ 1,696,625 $ 1,472,424