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- Revenues (Narrative) (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2021
USD ($)
segment
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Revenue $ 17,500 $ 19,900  
Total operating expenses $ 1,117,295 $ 929,767 $ 865,288
Number of business segments | segment 3