Significant Accounting Policies Additional Information (Details) - USD ($)		9 Months Ended
	Jan. 01, 2019	Sep. 30, 2019	Sep. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles
Net cash provided by (used for) operating activities		$ (436,131,000)	$ (354,138,000)
Accounting Standards Update 2016-02 [Member] | Minimum
Product Warranty Liability [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 115,681,000
Transamerican Auto Parts | Vehicles And Boats | Minimum
Product Warranty Liability [Line Items]
Period of warranties provided by Polaris		6 months
Transamerican Auto Parts | Vehicles And Boats | Maximum
Product Warranty Liability [Line Items]
Period of warranties provided by Polaris		10 years