Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2018	Oct. 31, 2017
Deferred Tax Assets, Net [Abstract]
Reserves and accrued liabilities	$ 36,706	$ 56,597
Depreciation and amortization	274,974	451,385
NOL and credit carry forward	560,603	803,622
Other	18,224	29,398
Gross deferred tax assets	890,507	1,341,002
Valuation allowance	(151,061)	(185,898)
Deferred tax asset, net of valuation allowance	$ 739,446	$ 1,155,104