Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Reconciliation of change in gross unrecognized tax benefits
Balance, beginning of period	$ 58,318	$ 78,105	$ 80,991
Increase in benefit as a result of tax positions taken in prior years	16,802	10,314	$ 5,699
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	9,005	$ 442
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	$ (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	$ (1,223)	(29,321)	$ (8,585)
Balance, end of period	$ 51,889	$ 58,318	$ 78,105