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Significant Accounting Policies - Summary of Maintenance, Repair, Storage, Rental, Charter Services and Parts and Accessories Revenue for Retail Operations by Location Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 2,309,288	$ 2,431,008	$ 2,394,706
Retail Operations [Member] | Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	404,723	384,452	380,200
Retail Operations [Member] | Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member] | Marina/Storage Locations [Member]
Disaggregation of Revenue [Line Items]
Revenue	273,078	267,296	265,847
Retail Operations [Member] | Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member] | Locations Without Marina/Storage [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 131,645	$ 117,156	$ 114,353

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