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INVENTORIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Inventory [Line Items]    
Raw materials $ 39,036 $ 35,883
Work-in-process 322,336 277,996
Finished goods 57,061 42,399
Rotable Assets 55,430 57,282
Total inventories $ 473,863 $ 413,560