Warranty (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Product Warranty Accrual [Roll Forward]
Balance at beginning of year	$ 54,568	$ 50,602	$ 46,116
Current year provisions	27,622	23,679	21,706
Costs incurred	(25,778)	(25,053)	(18,820)
Warranty reserves of acquired businesses	6,995	7,535	0
Foreign currency translation adjustment	118	(2,195)	1,600
Balance at end of year	$ 63,525	$ 54,568	$ 50,602