Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 60.1	$ 8.0
Other comprehensive income (loss), net of tax:
Foreign currency translation	38.4	(9.2)
Interest rate derivative	3.9	4.6
Minimum pension liabilities	(0.9)	28.1
Other comprehensive income, net of tax	41.4	23.5
Comprehensive income	101.5	31.5
Comprehensive income attributable to noncontrolling interests	4.0	0.9
Comprehensive income attributable to Greif, Inc.	$ 97.5	$ 30.6