ACQUISITIONS AND DIVESTITURES - Depreciation, Amortization, and Capital Expenditures from Discontinued Operations (Details) - Discontinued Operations, Held-for-Sale - Greif Containerboard Solutions, LLC - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2025
Disposal Group, Including Discontinued Operations [Line Items]
Depreciation and amortization	$ 9.0	$ 27.3
Capital expenditures	$ 9.4	$ 20.5