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EQUITY AND COMPREHENSIVE INCOME (LOSS) - Summary of Changes in Equity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Oct. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,154.2	$ 1,047.5
Net income	35.8	60.1
Other comprehensive income (loss):
Foreign currency translation	5.2	38.4
Derivative financial instruments	(5.7)	3.9
Minimum pension liabilities	(0.8)	(0.9)
Comprehensive income	34.5	101.5
Adoption of ASU 2016-16			$ (2.1)
Current period mark to redemption value of redeemable noncontrolling interest	0.2	(1.4)
Net income allocated to redeemable noncontrolling interests	(0.8)	(1.1)
Dividends paid to Greif, Inc. shareholders ($0.44 and $0.65 per Class A share and Class B share, respectively)	(25.7)	(24.5)
Dividends paid to noncontrolling interests	(0.4)	(0.5)
Long-term incentive shares issued	11.6	5.0
Ending balance	1,171.5	1,126.5
Other comprehensive income (loss), derivatives qualifying as hedges, tax	$ 1.9	$ 2.1
Capital Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (shares)	47,949	47,843
Beginning balance	$ 150.5	$ 144.2
Other comprehensive income (loss):
Long-term incentive shares issued (shares)	292	82
Long-term incentive shares issued	$ 11.0	$ 4.9
Ending balance	$ 161.5	$ 149.1
Ending balance (shares)	48,241	47,925
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (shares)	28,893	28,999
Beginning balance	$ (135.4)	$ (135.6)
Other comprehensive income (loss):
Long-term incentive shares issued (shares)	292	82
Long-term incentive shares issued	$ 0.6	$ 0.1
Ending balance	$ (134.8)	$ (135.5)
Ending balance (shares)	28,601	28,917
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,469.8	$ 1,360.5
Net income	29.7	56.5
Other comprehensive income (loss):
Derivative financial instruments		(0.6)
Current period mark to redemption value of redeemable noncontrolling interest	0.2	(1.4)
Dividends paid to Greif, Inc. shareholders ($0.44 and $0.65 per Class A share and Class B share, respectively)	(25.7)	(24.5)
Ending balance	1,471.9	1,390.5
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(377.1)	(358.2)
Other comprehensive income (loss):
Foreign currency translation	4.2	38.0
Derivative financial instruments	(5.7)	4.5
Minimum pension liabilities	(0.8)	(0.9)
Ending balance	(379.4)	(316.6)
Greif, Inc. Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,107.8	1,010.9
Net income	29.7	56.5
Other comprehensive income (loss):
Foreign currency translation	4.2	38.0
Derivative financial instruments	(5.7)	3.9
Minimum pension liabilities	(0.8)	(0.9)
Comprehensive income	27.4	97.5
Adoption of ASU 2016-16			(2.1)
Current period mark to redemption value of redeemable noncontrolling interest	0.2	(1.4)
Dividends paid to Greif, Inc. shareholders ($0.44 and $0.65 per Class A share and Class B share, respectively)	(25.7)	(24.5)
Long-term incentive shares issued	11.6	5.0
Ending balance	1,119.2	1,087.5
Non controlling interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	46.4	36.6
Net income	6.1	3.6
Other comprehensive income (loss):
Foreign currency translation	1.0	0.4
Net income allocated to redeemable noncontrolling interests	(0.8)	(1.1)
Dividends paid to noncontrolling interests	(0.4)	(0.5)
Ending balance	$ 52.3	$ 39.0
Class A Common Stock
Other comprehensive income (loss):
Dividends (in usd per share)	$ 0.44	$ 0.42
Class B Common Stock
Other comprehensive income (loss):
Dividends (in usd per share)	$ 0.65	$ 0.62
Accounting Standards Update 2016-16 | Retained Earnings
Other comprehensive income (loss):
Adoption of ASU 2016-16			$ (2.1)

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