Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 51.9	$ 39.9	$ 112.0	$ 47.9
Other comprehensive income (loss), net of tax:
Foreign currency translation	(26.3)	10.4	12.1	1.2
Derivative financial instruments	1.4	0.2	5.3	4.8
Minimum pension liabilities	2.7	1.3	1.8	29.4
Other comprehensive income (loss), net of tax	(22.2)	11.9	19.2	35.4
Comprehensive income	29.7	51.8	131.2	83.3
Comprehensive income attributable to noncontrolling interests	6.8	3.3	10.8	4.2
Comprehensive income attributable to Greif, Inc.	$ 22.9	$ 48.5	$ 120.4	$ 79.1