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Product Warranties - Narrative (Details) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2025 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Malibu and Axis Brand Boats | Gelcoat |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period | 1 year |  |  |  |
Malibu and Axis Brand Boats | Engines |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, term, hours | 500 hours |  |  |  |
Cobalt | Structural Warranty |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period | 5 years |  |  |  |
Cobalt | Bow-to-stern |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period |  | 5 years | 3 years |  |
Saltwater Fishing | Bow-to-stern |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period | 2 years |  |  |  |
Maverick, Pathfinder, and Hewes Brand Boats | Bow-to-stern |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period | 1 year |  |  |  |
Cobia | Bow-to-stern |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period | 3 years |  |  |  |
Malibu Brand Boats |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period |  |  |  | 5 years | 3 years
Axis Boats |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period |  |  |  | 5 years | 2 years
Maximum | Malibu and Axis Brand Boats |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period | 5 years |  |  |  |
Maximum | Malibu and Axis Brand Boats | Engines |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period | 5 years |  |  |  |
Maximum | Cobalt | Structural Warranty |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period | 10 years |  |  |  |
Maximum | Cobalt | Gelcoat |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period | 3 years |  |  |  |
Maximum | Saltwater Fishing | Structural Warranty and Gelcoat |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period | 5 years |  |  |  |
Maximum | Maverick, Pathfinder, and Hewes Brand Boats | Structural Warranty and Gelcoat |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period | 5 years |  |  |  |
Maximum | Cobia | Structural Warranty and Gelcoat |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Standard product warranty, period | 10 years |  |  |  |

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