Acquisitions - Cotton Distributors Inc. (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Net operating revenues		$ 1,621.0	$ 1,475.9	$ 1,150.0
Net income		238.5	$ 207.1	$ 116.3
Cotton Distributors Inc.
Business Acquisition [Line Items]
Purchase price	$ 42.7
Net operating revenues		36.9
Net income		$ 18.6