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Revenue - Schedule of Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Contract assets:    
Current $ 968,283 $ 988,634
Long-term 63,855 62,600
Total 1,032,138 1,051,234
Contract liabilities:    
Advance payments, billings in excess of costs incurred and deferred revenue $ 23,157 $ 26,018