Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015	Nov. 01, 2017	Oct. 31, 2014
Valuation Allowance [Line Items]
Provision at statutory rate			35.00%	35.00%	35.00%
Unrecognized tax benefits, interest and penalties accrued		$ 4,000	$ 4,000	$ 4,600
Interest and penalties expense			600	1,200	$ 900
Deferred tax liability		384,000	384,000
One-time benefit related to the valuation allowance reversal		1,125,000
Reversal of deferred tax asset valuation allowance		26,000	25,964
Valuation allowance		185,898	185,898	$ 1,489,780	$ 1,495,672		$ 1,496,835
Net operating loss carryforwards subject to expiration		1,650,000	1,650,000
Income tax credit carryforwards subject to expiration		100,000	100,000
Retained Earnings | Accounting Standards Update 2016-09
Valuation Allowance [Line Items]
Recognition of all excess tax benefits previously unrecognized		$ 62,000	$ 62,000
Scenario, Forecast | Accounting Standards Update 2016-09
Valuation Allowance [Line Items]
Valuation allowance related to deductions for stock compensation	$ 38,000
Scenario, Forecast | Retained Earnings | Accounting Standards Update 2016-09
Valuation Allowance [Line Items]
Recognition of all excess tax benefits previously unrecognized						$ 62,000