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Significant Accounting Policies Activity in Polaris Accrued Warranty Reserve (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accounting Policies [Abstract]          
Deferred tax liabilities $ 7,054   $ 7,054   $ 10,128
Activity in Product Warranty Reserve [Roll Forward]          
Balance at beginning of period 106,155 $ 108,403 123,840 $ 119,274  
Additions to warranty reserve through acquisitions 13,799 0 13,799 0  
Additions charged to expense 37,741 42,039 79,913 103,855  
Warranty claims paid, net (35,151) (38,357) (95,008) (111,044)  
Balance at end of period $ 122,544 $ 112,085 $ 122,544 $ 112,085