CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Cash flows from operating activities:
Net income	$ 180.9	$ 26.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	60.3	67.5
Non-cash asset impairment charges	0.2	0.3
Non-cash pension settlement charges	0.9	0.0
Gain on disposals of properties, plants and equipment, net	(215.7)	(2.4)
Loss on disposals of businesses, net	3.1	1.1
Unrealized foreign exchange (gain) loss	(0.2)	0.2
Deferred income tax benefit	(49.9)	(85.5)
Non-cash lease expense	11.5	10.3
Other, net	0.2	0.9
Increase (decrease) in cash from changes in certain assets and liabilities, net of impacts from acquisitions:
Trade accounts receivable	56.8	76.2
Inventories	(10.7)	(9.0)
Accounts payable	(32.5)	(60.0)
Restructuring reserves	(2.6)	(0.2)
Operating leases	(12.1)	(9.8)
Pension and post-retirement benefit liabilities	(2.9)	(7.0)
Other, net	(11.7)	7.3
Net cash (used in) provided by operating activities	(24.4)	16.6
Cash flows from investing activities:
Purchases of business, net of cash acquired	0.0	(1.2)
Purchases of properties, plants and equipment	(33.0)	(42.7)
Payments for deferred purchase price of acquisitions	(0.6)	(1.2)
Proceeds from the sale of properties, plants, equipment and other assets	460.9	4.2
Payments for the sale of businesses	0.0	(1.1)
Proceeds from hedging derivatives	0.0	22.5
Other, net	0.0	(2.9)
Net cash provided (used in) investing activities	427.3	(22.4)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	540.3	674.4
Payments on long-term debt	(800.8)	(588.8)
Proceeds (payments) on short-term borrowings, net	8.2	(2.9)
Proceeds from trade accounts receivable credit facility	9.1	1.8
Payments on trade accounts receivable credit facility	(16.7)	(33.6)
Dividends paid to Greif, Inc. shareholders	(32.5)	(31.2)
Dividends paid to noncontrolling interests	(7.8)	(11.8)
Payments for share repurchases	(128.1)	0.0
Other, net	(1.4)	(1.6)
Net cash (used in) provided by financing activities	(429.7)	6.3
Effects of exchange rates on cash	13.6	(32.1)
Net decrease in cash and cash equivalents	(13.2)	(31.6)
Cash and cash equivalents at beginning of period	256.7	216.4
Cash and cash equivalents at end of period	$ 243.5	$ 184.8