Commitments and Contingencies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Change in warranty return accrual [Roll Forward]
Balance at beginning of period	$ 16,575,000	$ 16,410,000	$ 19,475,000	$ 16,646,000
Charged to expense/additions	26,637,000	29,655,000	82,353,000	84,408,000
Amounts processed	(28,226,000)	(26,913,000)	(86,842,000)	(81,902,000)
Balance at end of period	14,986,000	$ 19,152,000	14,986,000	$ 19,152,000
Contingencies [Abstract]
Estimated additional import duties	$ 17,000,000		$ 17,000,000