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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 138,718 $ 92,216
Work-in-process 129,736 136,068
Finished goods 235,415 185,950
Total $ 503,869 $ 414,234