Consolidation of Variable Interest Entities - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Oct. 31, 2016
Variable Interest Entity [Line Items]
Restricted bank financial instruments under Buyer SPE	$ 50.9		$ 50.9		$ 50.9
Interest income of Buyer SPE	0.6	$ 0.6		$ 1.8
Net income (loss) attributable to noncontrolling interests	3.6	0.3	10.1	2.6
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Net income (loss) attributable to noncontrolling interests	(1.5)	1.9	$ (3.3)	4.5
Buyer Spe
Variable Interest Entity [Line Items]
Ownership interest			0.00%
STA Timber
Variable Interest Entity [Line Items]
Debt instrument, principal outstanding	43.3		$ 43.3		$ 43.3
Interest expense	$ 0.5	$ 0.5	$ 1.7	$ 1.7