Acquisitions (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2022 USD ($) Location Renewaloption	Dec. 31, 2021 USD ($)	Sep. 30, 2022 USD ($)
Acquisition [Abstract]
Cash paid for acquisition	$ 28,611	$ 278,798
Payment of contingent consideration	2,600
Acquisition purchase price funded by affiliate financing	10,600	0
Minimum payout due of contingent consideration	0
Maximum payout due of contingent consideration	$ 0
Number of retail locations | Location	100
Number of lease renewal options | Renewaloption	2
Summary of Assets Acquired and Liabilities Assumed [Abstract]
Goodwill	$ 397,468		$ 378,588
Consideration transferred	41,800
Revenue	366,659	336,272
Income before income tax expense	14,812	28,375
Costs related to acquisition	800	3,000
Unaudited Pro Forma Results of Operations [Abstract]
Pro forma revenue	369,363	428,136
Pro forma net income	11,542	$ 25,916
Total Acquisitions [Member]
Summary of Assets Acquired and Liabilities Assumed [Abstract]
Accounts receivable	188
Inventories	6,232
Prepaid expenses	73
Property and equipment	11,587
Operating lease right-of-use assets	2,952
Identifiable intangible assets	8,400
Goodwill	18,880
Accounts payable	(17)
Accrued expenses	(354)
Customer deposits	(1,000)
Operating lease liabilities	(2,952)
Notes payable - floor plan	(2,228)
Aggregate acquisition date fair value	41,761
Consideration transferred	41,761
Revenue	8,700
Income before income tax expense	$ 500
Harbor View Marine Acquisition [Member]
Acquisition [Abstract]
Number of retail locations | Location	2
Gain (loss) on sale and leaseback transaction	$ 0
Initial lease contract term	15 years
Lease renewal option term	5 years