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Significant Accounting Policies Activity in Polaris Accrued Warranty Reserve (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Accounting Policies [Abstract]          
Deferred tax liabilities $ 5,357   $ 5,357   $ 6,490
Activity in Product Warranty Reserve [Roll Forward]          
Balance at beginning of period 116,217 $ 116,286 121,824 $ 123,840  
Additions to reserve related to acquisitions 8,809 0 8,809 0  
Additions charged to expense 36,854 26,141 62,873 42,172  
Warranty claims paid, net (29,122) (36,272) (60,748) (59,857)  
Balance at end of period $ 132,758 $ 106,155 $ 132,758 $ 106,155