Restructuring and Impairment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment	$ 727	$ 0	$ 3,013	$ 11,847
Restructuring and Impairment
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment	200		1,500
New Boat Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment	500		1,500
Dealerships
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment	500		1,600
Distribution
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment	$ 200		$ 1,400