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Warranty (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Product Warranty Accrual [Roll Forward]      
Balance at beginning of period $ 46,116 $ 48,422 $ 39,810
Current year provisions 21,706 17,852 19,735
Costs incurred (18,820) (15,945) (13,998)
Foreign currency translation adjustment 1,600 (4,213) 2,875
Balance at end of period $ 50,602 $ 46,116 $ 48,422