Commitments and Contingencies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Change in warranty return accrual [Roll Forward]
Balance at beginning of period	$ 22,499,000	$ 16,575,000	$ 18,300,000	$ 19,475,000
Charged to expense	26,194,000	26,637,000	80,155,000	82,353,000
Amounts processed	(31,540,000)	(28,226,000)	(81,302,000)	(86,842,000)
Balance at end of period	17,153,000	$ 14,986,000	17,153,000	$ 14,986,000
Contingencies [Abstract]
Estimated additional import duties	$ 17,000,000		$ 17,000,000