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Quarterly Financial Data (unaudited) - Quarterly Detail of Impact of Restatement on Consolidated Statements of Income (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net sales	$ 1,048.1us-gaap_SalesRevenueNet	$ 1,124.0us-gaap_SalesRevenueNet	$ 1,065.5us-gaap_SalesRevenueNet	$ 1,001.5us-gaap_SalesRevenueNet	$ 1,094.2us-gaap_SalesRevenueNet	$ 1,094.8us-gaap_SalesRevenueNet	$ 1,054.7us-gaap_SalesRevenueNet	$ 976.2us-gaap_SalesRevenueNet	$ 4,239.1us-gaap_SalesRevenueNet	$ 4,219.9us-gaap_SalesRevenueNet	$ 4,129.5us-gaap_SalesRevenueNet
Cost of products sold									3,428.1us-gaap_CostOfGoodsAndServicesSold	3,387.7us-gaap_CostOfGoodsAndServicesSold	3,350.0us-gaap_CostOfGoodsAndServicesSold
Gross profit	202.9us-gaap_GrossProfit	217.7us-gaap_GrossProfit	204.3us-gaap_GrossProfit	186.1us-gaap_GrossProfit	226.1us-gaap_GrossProfit	217.2us-gaap_GrossProfit	202.4us-gaap_GrossProfit	186.5us-gaap_GrossProfit	811.0us-gaap_GrossProfit	832.2us-gaap_GrossProfit	779.5us-gaap_GrossProfit
Selling, general and administrative expenses									496.7	477.3	469.8
Non-cash asset impairment charges	70.2us-gaap_AssetImpairmentCharges				26.9us-gaap_AssetImpairmentCharges				85.8us-gaap_AssetImpairmentCharges	31.4us-gaap_AssetImpairmentCharges	13.2us-gaap_AssetImpairmentCharges
Timberland gains					17.3us-gaap_GainLossOnSaleOfTimberProperty				17.1us-gaap_GainLossOnSaleOfTimberProperty	17.3us-gaap_GainLossOnSaleOfTimberProperty	0us-gaap_GainLossOnSaleOfTimberProperty
Operating profit									249.3us-gaap_OperatingIncomeLoss	341.6us-gaap_OperatingIncomeLoss	281.0us-gaap_OperatingIncomeLoss
Other (income) expense, net									(81.8)	(83.8)	(89.9)
Other (income) expense, net									(9.5)us-gaap_OtherNonoperatingIncomeExpense	(13.1)us-gaap_OtherNonoperatingIncomeExpense	(7.7)us-gaap_OtherNonoperatingIncomeExpense
Income before income tax expense and equity earnings of unconsolidated affiliates, net									158.0	243.4	183.4
Income tax (benefit) expense									115.0us-gaap_IncomeTaxExpenseBenefit	98.8us-gaap_IncomeTaxExpenseBenefit	61.1us-gaap_IncomeTaxExpenseBenefit
Net income	(35.5)us-gaap_ProfitLoss	11.5us-gaap_ProfitLoss	37.1us-gaap_ProfitLoss	31.8us-gaap_ProfitLoss	35.2us-gaap_ProfitLoss	48.4us-gaap_ProfitLoss	39.7us-gaap_ProfitLoss	24.2us-gaap_ProfitLoss	44.9us-gaap_ProfitLoss	147.5us-gaap_ProfitLoss	123.6us-gaap_ProfitLoss
Net (income) loss attributable to noncontrolling interests									(46.6)	2.8	5.5
Net income attributable to Greif, Inc.	8.7us-gaap_NetIncomeLoss	13.7us-gaap_NetIncomeLoss	38.4us-gaap_NetIncomeLoss	30.7us-gaap_NetIncomeLoss	38.0us-gaap_NetIncomeLoss	46.2us-gaap_NetIncomeLoss	37.6us-gaap_NetIncomeLoss	22.9us-gaap_NetIncomeLoss	91.5us-gaap_NetIncomeLoss	144.7us-gaap_NetIncomeLoss	118.1us-gaap_NetIncomeLoss
Class A Common Stock [Member]
Basic earnings per share attributable to Greif, Inc.:
EPS Basic	$ 0.15	$ 0.23	$ 0.65	$ 0.53	$ 0.65	$ 0.79	$ 0.64	$ 0.40	$ 1.56	$ 2.47	$ 2.03
Diluted earnings per share attributed to Greif, Inc.:
EPS Diluted	$ 0.15	$ 0.23	$ 0.65	$ 0.53	$ 0.65	$ 0.79	$ 0.64	$ 0.40	$ 1.56	$ 2.47	$ 2.03
Class B Common Stock [Member]
Basic earnings per share attributable to Greif, Inc.:
EPS Basic	$ 0.22	$ 0.35	$ 0.98	$ 0.78	$ 0.97	$ 1.18	$ 0.96	$ 0.58	$ 2.33	$ 3.70	$ 3.03
Diluted earnings per share attributed to Greif, Inc.:
EPS Diluted	$ 0.22	$ 0.35	$ 0.98	$ 0.78	$ 0.97	$ 1.18	$ 0.96	$ 0.58	$ 2.33	$ 3.70	$ 3.03
As Reported [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net sales		1,161.1	1,100.7	1,034.4		1,129.7	1,088.9	1,008.6		4,353.4	4,269.5
Cost of products sold		944.8	896.5	847.8		912.4	886.3	821.9		3,520.8	3,489.9
Gross profit		216.3	204.2	186.6		217.3	202.6	186.7		832.6	779.6
Selling, general and administrative expenses		129.4	135.4	121.5		118.2	120.1	122.6			468.4
Non-cash asset impairment charges							2.2			34.0	12.9
Timberland gains			(8.2)	(8.7)						(17.5)
Operating profit		59.6	75.8	72.0		96.7	83.9	64.0		339.6	282.8
Other (income) expense, net		1.4	1.5	4.6		4.0				10.8	7.5
Other (income) expense, net							0.8
Income before income tax expense and equity earnings of unconsolidated affiliates, net		37.5	53.9	47.0		73.5	61.7	38.0		243.7	185.4
Income tax (benefit) expense						25.9	19.6	13.2		97.6	58.8
Net income		10.0	34.5	30.6		48.8	42.3	24.9		149.0	127.9
Net (income) loss attributable to noncontrolling interests						(2.1)				(1.7)
Net income attributable to Greif, Inc.		12.2	35.8	29.5		46.7	40.2	23.6		147.3	122.4
As Reported [Member] \| Class A Common Stock [Member]
Basic earnings per share attributable to Greif, Inc.:
EPS Basic		$ 0.21	$ 0.61	$ 0.51		$ 0.80	$ 0.69	$ 0.41		$ 2.52	$ 2.10
Diluted earnings per share attributed to Greif, Inc.:
EPS Diluted		$ 0.21	$ 0.61	$ 0.51		$ 0.80	$ 0.69	$ 0.41		$ 2.52	$ 2.10
As Reported [Member] \| Class B Common Stock [Member]
Basic earnings per share attributable to Greif, Inc.:
EPS Basic		$ 0.31	$ 0.92	$ 0.75		$ 1.20	$ 1.03	$ 0.60		$ 3.77	$ 3.14
Diluted earnings per share attributed to Greif, Inc.:
EPS Diluted		$ 0.31	$ 0.92	$ 0.75		$ 1.20	$ 1.03	$ 0.60		$ 3.77	$ 3.14
Adjustments [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net sales		(37.1)	(35.2)	(32.9)		(34.9)	(34.2)	(32.4)		(133.5)	(140.0)
Cost of products sold		(38.5)	(35.3)	(32.4)		(34.8)	(34.0)	(32.2)		(133.1)	(139.9)
Gross profit		1.4	0.1	(0.5)		(0.1)	(0.2)	(0.2)		(0.4)	(0.1)
Selling, general and administrative expenses		(0.3)	(2.7)	(0.2)		0.1	0.2	0.2			1.4
Non-cash asset impairment charges							(0.1)			(2.6)	0.3
Timberland gains			(0.5)	0.3						0.2
Operating profit		1.7	3.3	(0.6)		(0.2)	(0.3)	(0.4)		2.0	(1.8)
Other (income) expense, net		0.2	0.7	(1.8)		(0.1)				2.3	0.2
Other (income) expense, net							2.0
Income before income tax expense and equity earnings of unconsolidated affiliates, net		1.5	2.6	1.2		(0.1)	(2.3)	(0.4)		(0.3)	(2.0)
Income tax (benefit) expense						0.3	0.3	0.3		1.2	2.3
Net income		1.5	2.6	1.2		(0.4)	(2.6)	(0.7)		(1.5)	(4.3)
Net (income) loss attributable to noncontrolling interests						(0.1)				(1.1)
Net income attributable to Greif, Inc.		1.5	2.6	1.2		(0.5)	(2.6)	(0.7)		(2.6)	(4.3)
Adjustments [Member] \| Class A Common Stock [Member]
Basic earnings per share attributable to Greif, Inc.:
EPS Basic		$ 0.02	$ 0.04	$ 0.02		$ (0.01)	$ (0.05)	$ (0.01)		$ (0.05)	$ (0.07)
Diluted earnings per share attributed to Greif, Inc.:
EPS Diluted		$ 0.02	$ 0.04	$ 0.02		$ (0.01)	$ (0.05)	$ (0.01)		$ (0.05)	$ (0.07)
Adjustments [Member] \| Class B Common Stock [Member]
Basic earnings per share attributable to Greif, Inc.:
EPS Basic		$ 0.04	$ 0.06	$ 0.03		$ (0.02)	$ (0.07)	$ (0.02)		$ (0.07)	$ (0.11)
Diluted earnings per share attributed to Greif, Inc.:
EPS Diluted		$ 0.04	$ 0.06	$ 0.03		$ (0.02)	$ (0.07)	$ (0.02)		$ (0.07)	$ (0.11)
As Adjusted [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net sales		1,124.0	1,065.5	1,001.5		1,094.8	1,054.7	976.2		4,219.9	4,129.5
Cost of products sold		906.3	861.2	815.4		877.6	852.3	789.7		3,387.7	3,350.0
Gross profit		217.7	204.3	186.1		217.2	202.4	186.5		832.2	779.5
Selling, general and administrative expenses		129.1	132.7	121.3		118.3	120.3	122.8			469.8
Non-cash asset impairment charges							2.1			31.4	13.2
Timberland gains			(8.7)	(8.4)						(17.3)
Operating profit		61.3	79.1	71.4		96.5	83.6	63.6		341.6	281.0
Other (income) expense, net		1.6	2.2	2.8		3.9				13.1	7.7
Other (income) expense, net							2.8
Income before income tax expense and equity earnings of unconsolidated affiliates, net		39.0	56.5	48.2		73.4	59.4	37.6		243.4	183.4
Income tax (benefit) expense						26.2	19.9	13.5		98.8	61.1
Net income		11.5	37.1	31.8		48.4	39.7	24.2		147.5	123.6
Net (income) loss attributable to noncontrolling interests						(2.2)				(2.8)
Net income attributable to Greif, Inc.		$ 13.7	$ 38.4	$ 30.7		$ 46.2	$ 37.6	$ 22.9		$ 144.7	$ 118.1
As Adjusted [Member] \| Class A Common Stock [Member]
Basic earnings per share attributable to Greif, Inc.:
EPS Basic		$ 0.23	$ 0.65	$ 0.53		$ 0.79	$ 0.64	$ 0.40		$ 2.47	$ 2.03
Diluted earnings per share attributed to Greif, Inc.:
EPS Diluted		$ 0.23	$ 0.65	$ 0.53		$ 0.79	$ 0.64	$ 0.40		$ 2.47	$ 2.03
As Adjusted [Member] \| Class B Common Stock [Member]
Basic earnings per share attributable to Greif, Inc.:
EPS Basic		$ 0.35	$ 0.98	$ 0.78		$ 1.18	$ 0.96	$ 0.58		$ 3.70	$ 3.03
Diluted earnings per share attributed to Greif, Inc.:
EPS Diluted		$ 0.35	$ 0.98	$ 0.78		$ 1.18	$ 0.96	$ 0.58		$ 3.70	$ 3.03