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Commitments and Contingencies (Details) - USD ($)
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Change in warranty return accrual [Roll Forward]    
Balance at beginning of period $ 18,300,000 $ 19,475,000
Charged to expense 23,089,000 23,185,000
Amounts processed (19,197,000) (26,842,000)
Balance at end of period 22,192,000 $ 15,818,000
Contingencies [Abstract]    
Estimated additional import duties $ 17,000,000