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Product Warranties Narrative (Details)
 9 Months Ended 12 Months Ended
Mar. 31, 2018
Jun. 30, 2016
Malibu and Axis Products MY16 and subsequent    
Product Warranty Liability [Line Items]    
Standard product warranty, period 5 years  
Malibu boats MY15 and prior    
Product Warranty Liability [Line Items]    
Standard product warranty, period   3 years
Axis boats MY15 and prior    
Product Warranty Liability [Line Items]    
Standard product warranty, period   2 years
Cobalt structural products    
Product Warranty Liability [Line Items]    
Standard product warranty, period 10 years  
Cobalt bow-to-stern products    
Product Warranty Liability [Line Items]    
Standard product warranty, period 5 years  
Gelcoat products    
Product Warranty Liability [Line Items]    
Standard product warranty, period 3 years