Income Taxes (Tables)

3 Months Ended

Jan. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Significant Components of Deferred Tax Assets and Liabilities

The significant components of DTA are as follows (in thousands):

	January 31,			October 31,
	2018			2017
Deferred tax assets:
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