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Commitments and Contingencies (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Change in warranty return accrual [Roll Forward]
Balance at beginning of period	$ 22,192,000	$ 15,818,000	$ 18,300,000	$ 19,475,000
Charged to expense	30,872,000	32,531,000	53,961,000	55,716,000
Amounts processed	(30,565,000)	(31,774,000)	(49,762,000)	(58,616,000)
Balance at end of period	22,499,000	$ 16,575,000	22,499,000	$ 16,575,000
Contingencies [Abstract]
Estimated additional import duties	$ 17,000,000		$ 17,000,000

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

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Amount of decrease in the standard product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard product warranty. Excludes extended product warranties.

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Amount of increase in the standard product warranty accrual from warranties issued. Excludes extended product warranties.

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