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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, 2023	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 2,394,706	$ 2,308,098	$ 2,063,257
Retail Operations [Member] | Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	380,200	246,291	210,492
Retail Operations [Member] | Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member] | Marina/Storage Locations [Member]
Disaggregation of Revenue [Line Items]
Revenue	265,847	143,189	127,558
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	$ 114,353	$ 103,102	$ 82,934

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