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Segment Information - Additional Information (Detail)
 12 Months Ended
Sep. 30, 2025
Feet
Segment
Segment Reporting Information [Line Items]  
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] srt:ChiefExecutiveOfficerMember
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description Our CODM reviews income from operations by segment for purposes of making operating decisions, assessing financial performance, and deciding how to allocate resources (including team members, property, and financial or capital resources). The CODM considers forecast-to-actual variances when making decisions about allocating resources to the segments.
Segment Reporting, No Asset Information [true false] false
Number of reportable segments | Segment 2
Minimum [Member]  
Segment Reporting Information [Line Items]  
Number of models producing premium yachts 33
Maximum [Member]  
Segment Reporting Information [Line Items]  
Number of models producing premium yachts 60