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INVENTORIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Inventory [Line Items]    
Raw materials $ 37,128 $ 35,883
Work-in-process 306,634 277,996
Finished goods 53,776 42,399
Rotable Assets 56,864 57,282
Total inventories $ 454,402 $ 413,560