Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 39.9	$ 32.5	$ 47.9	$ 22.6
Other comprehensive income (loss), net of tax:
Foreign currency translation	10.4	46.3	1.2	18.0
Interest rate derivative	0.2	0.0	4.8	0.0
Minimum pension liabilities	1.3	(1.3)	29.4	0.6
Other comprehensive income, net of tax	11.9	45.0	35.4	18.6
Comprehensive income	51.8	77.5	83.3	41.2
Comprehensive income attributable to noncontrolling interests	3.3	4.1	4.2	1.7
Comprehensive income attributable to Greif, Inc.	$ 48.5	$ 73.4	$ 79.1	$ 39.5