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Commitments and Contingencies (Details) - USD ($)
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Change in warranty return accrual [Roll Forward]    
Balance at beginning of period $ 19,475,000 $ 16,646,000
Charged to expense/additions 23,185,000 23,893,000
Amounts processed (26,842,000) (25,996,000)
Balance at end of period 15,818,000 $ 14,543,000
Contingencies [Abstract]    
Estimated additional import duties $ 17,000,000