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Product Warranties (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) hour	Dec. 31, 2019 USD ($)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Product Warranty Liability [Line Items]
Standard product warranty, hours (up to) | hour			500
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 29,077	$ 25,034	$ 27,500	$ 23,820
Add: Warranty expense	4,791	5,196	9,646	9,102
Additions for acquisitions	883	0	883	0
Less: Warranty claims paid	(3,705)	(3,520)	(6,983)	(6,212)
Ending balance	$ 31,046	$ 26,710	$ 31,046	$ 26,710
Malibu, Axis and Cobalt Brand Boats
Product Warranty Liability [Line Items]
Standard product warranty, period (up to)			5 years
Malibu and Axis Brand Boats
Product Warranty Liability [Line Items]
Standard product warranty, period (up to)			5 years
Gelcoat warranty, period (up to)			1 year
Malibu Brand Boats
Product Warranty Liability [Line Items]
Standard product warranty, period (up to)							5 years	3 years
Axis Boats
Product Warranty Liability [Line Items]
Standard product warranty, period (up to)							5 years	2 years
Cobalt
Product Warranty Liability [Line Items]
Structural warranty, period (up to)			10 years
Bow-to-stern warranty on all components			5 years		5 years	3 years
Gelcoat warranty, period (up to)			3 years
Maverick, Pathfinder, and Hewes Brand Boats
Product Warranty Liability [Line Items]
Standard product warranty, period (up to)			5 years
Bow-to-stern warranty on all components			1 year
Saltwater Fishing
Product Warranty Liability [Line Items]
Standard product warranty, period (up to)			5 years
Bow-to-stern warranty on all components			2 years
Cobia
Product Warranty Liability [Line Items]
Standard product warranty, period (up to)			10 years
Bow-to-stern warranty on all components			3 years

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