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Product Warranties - Narrative (Details)
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2016
Product Warranty Liability [Line Items]    
Bow-to-stern warranty on all components 5 years  
Malibu and Axis Brand Boats    
Product Warranty Liability [Line Items]    
Standard product warranty, period (up to) 1 year 5 years
Malibu Brand Boats    
Product Warranty Liability [Line Items]    
Standard product warranty, period (up to)   3 years
Axis Boats    
Product Warranty Liability [Line Items]    
Standard product warranty, period (up to)   2 years
Cobalt    
Product Warranty Liability [Line Items]    
Standard product warranty, period (up to) 3 years  
Structural warranty, period (up to) 10 years