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Warranty (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Product Warranty Accrual [Roll Forward]      
Balance at beginning of year $ 50,602 $ 46,116 $ 48,422
Current year provisions 23,679 21,706 17,852
Costs incurred (25,053) (18,820) (15,945)
Warranty reserves of acquired business - Alpha 7,535 0 0
Foreign currency translation adjustment (2,195) 1,600 (4,213)
Balance at end of year $ 54,568 $ 50,602 $ 46,116