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Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2016
Jun. 30, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]        
Beginning balance $ 23,820 $ 17,217    
Add: Warranty expense 3,906 2,916    
Less: Warranty claims paid (2,692) (2,134)    
Ending balance $ 25,034 $ 17,999    
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]        
Structural warranty, period (up to) 10 years      
Pursuit        
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)     5 years