Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Deferred tax assets:
Reserves and accrued liabilities	$ 56,597	$ 59,791
Depreciation and amortization	451,385	298,497
NOL and credit carry forward	803,622	1,109,304
Other	29,398	23,304
Gross deferred tax assets	1,341,002	1,490,896
Valuation allowance	(185,898)	(1,489,780)	$ (1,495,672)	$ (1,496,835)
Deferred tax asset, net of valuation allowance	$ 1,155,104	$ 1,116