Income Taxes - Components of Net Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Oct. 31, 2015	Oct. 31, 2014
Deferred income tax assets:
Allowance for doubtful accounts	$ 4,784	$ 6,748
Unrealized gains and losses	12,463	9,351
Tax loss carry forwards	427,877	419,584
Accruals and other	100,194	80,028
Subtotal of deferred income tax assets	545,318	515,711
Deferred income tax liabilities:
Depreciation and amortization	(4,045)	(8,411)
Intangibles	(23,805)	(26,766)
Subtotal of deferred income tax liabilities	(27,850)	(35,177)
Deferred income tax assets, net	517,468	480,534
Valuation allowance	(541,042)	(495,938)
Net deferred income tax liabilities	$ (23,574)	$ (15,404)