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Earnings Per Share - Computation of Earnings Per Share Basic and Diluted (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Numerator for basic and diluted EPS
Net income attributable to Greif	$ 12.4	$ 8.6	$ 20.8	$ 30.1	$ 8.7	$ 13.7	$ 38.4	$ 30.7	$ 71.9	$ 91.5	$ 144.7
Cash dividends									98.7	98.6	98.3
Undistributed net (loss) income attributable to Greif, Inc.									$ (26.8)	$ (7.1)	$ 46.4
Class A Common Stock [Member]
Denominator for basic EPS
Denominator for basic EPS	25,693,564	25,692,973	25,678,393	25,607,886	25,603,452	25,576,452	25,540,341	25,470,354	25,668,204	25,547,650	25,399,256
Denominator for diluted EPS
Denominator for diluted EPS	25,701,264	25,698,547	25,688,653	25,617,814	25,554,934	25,581,952	25,560,846	25,495,642	25,674,105	25,552,986	25,422,322
EPS Basic
EPS Basic	$ 0.21	$ 0.15	$ 0.35	$ 0.52	$ 0.15	$ 0.23	$ 0.65	$ 0.53	$ 1.23	$ 1.56	$ 2.47
EPS Diluted
EPS Diluted	$ 0.21	$ 0.15	$ 0.35	$ 0.52	$ 0.15	$ 0.23	$ 0.65	$ 0.53	$ 1.23	$ 1.56	$ 2.47
Class B Common Stock [Member]
Denominator for basic EPS
Denominator for basic EPS	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966
Denominator for diluted EPS
Denominator for diluted EPS	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966	22,119,966
EPS Basic
EPS Basic	$ 0.32	$ 0.22	$ 0.53	$ 0.76	$ 0.22	$ 0.35	$ 0.98	$ 0.78	$ 1.83	$ 2.33	$ 3.70
EPS Diluted
EPS Diluted	$ 0.32	$ 0.22	$ 0.53	$ 0.76	$ 0.22	$ 0.35	$ 0.98	$ 0.78	$ 1.83	$ 2.33	$ 3.70

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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