Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Reconciliation of change in gross unrecognized tax benefits
Balance, beginning of period	$ 51,889	$ 58,318	$ 78,105
Increase in benefit as a result of tax positions taken in prior years	8,110	16,802	10,314
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	694	9,005	442
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	(28,976)	(31,013)
Decrease in benefit as a result of completion of tax audits			(1,222)
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	(1,445)	(1,223)	(29,321)
Balance, end of period	$ 30,272	$ 51,889	$ 58,318