Acquisitions and Divestitures (Acquisition) (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Business Combination [Line Items]
Cash paid at closing		$ 59.9	$ 0.0	$ 0.0
Goodwill acquired		$ 31.3
Ijsfabriek Strombeek Company
Business Combination [Line Items]
Business combination, voting equity interest acquired	100.00%
Total consideration, net of cash acquired	$ 74.2
Cash paid at closing	59.9
Plant and equipment acquired	32.2
Goodwill acquired	31.3
Intangible assets acquired	$ 15.8
Ijsfabriek Strombeek Company | Customer relationships
Business Combination [Line Items]
Acquired finite-lived intangible assets, weighted average amortization period	10 years