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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 205,876 $ 119,317 $ 9,283
Currency translation gain (loss):      
Currency translation gain (loss), net of taxes (5,670) 2,273 (19,054)
Reclassification of currency translation loss (gain) included in other income (expense), net 0 3,913 (171)
Defined benefit plans:      
Net gain (loss) and prior service credits (costs), net of taxes 14,201 (837) (12,998)
Reclassification of amortization included in operating expenses 1,490 1,630 322
Hedging gain (loss):      
Deferred hedging gain (loss), net of taxes 2,928 (2,431) 8,971
Reclassification of hedging gain included in cost of goods sold (1,670) (3,296) (4,505)
Other comprehensive income (loss) 11,279 1,252 (27,435)
Total comprehensive income (loss) $ 217,155 $ 120,569 $ (18,152)