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Commitments and Contingencies (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Change in warranty return accrual [Roll Forward]        
Balance at beginning of period $ 15,818,000 $ 14,543,000 $ 19,475,000 $ 16,646,000
Charged to expense/additions 32,531,000 30,860,000 55,716,000 54,753,000
Amounts processed (31,774,000) (28,993,000) (58,616,000) (54,989,000)
Balance at end of period 16,575,000 $ 16,410,000 16,575,000 $ 16,410,000
Contingencies [Abstract]        
Estimated additional import duties $ 17,000,000   $ 17,000,000