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Revenue Recognition - Summary of Maintenance, Repair, Storage, Rental, Charter Services and Parts and Accessories Revenue for Retail Operations by Location Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 582,892	$ 570,340	$ 1,110,166	$ 1,078,267
Retail Operations [Member] | Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	96,722	96,695	195,277	188,678
Retail Operations [Member] | Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member] | Marina/Storage Locations [Member]
Disaggregation of Revenue [Line Items]
Revenue	71,733	70,655	141,323	136,454
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	$ 24,989	$ 26,040	$ 53,954	$ 52,224

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