Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 18,700,000	$ 28,200,000	$ 45,800,000	$ 64,200,000
Effective tax rate	68.20%	72.30%	44.30%	44.70%
Discrete income tax expense (benefit)	$ (1,300,000)	$ 3,500,000
Deferred income taxes	0		$ 0
Increase in Valuation Allowances [Member]
Operating Loss Carryforwards [Line Items]
Discrete income tax expense (benefit)	(2,000,000)	7,000,000
Return to Provision Adjustments [Member]
Operating Loss Carryforwards [Line Items]
Discrete income tax expense (benefit)	$ 800,000	$ (3,000,000)