Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 47.5	$ 46.4	$ 95.4	$ 69.0
Other comprehensive income (loss), net of tax:
Foreign currency translation	30.5	(27.6)	31.7	(9.6)
Interest rate derivative	(0.8)	0.0	4.0	0.0
Minimum pension liabilities	0.4	2.9	29.8	3.5
Other comprehensive income (loss), net of tax	30.1	(24.7)	65.5	(6.1)
Comprehensive income	77.6	21.7	160.9	62.9
Comprehensive income (loss) attributable to noncontrolling interests	4.2	(3.4)	8.4	(1.7)
Comprehensive income attributable to Greif, Inc.	$ 73.4	$ 25.1	$ 152.5	$ 64.6