Income Taxes (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2016 USD ($)	Apr. 30, 2015 USD ($)	Apr. 30, 2016 USD ($)	Apr. 30, 2015 USD ($)	Oct. 31, 2015 USD ($)
Income Taxes (Textual) [Abstract]
Income Tax Expense	$ 51,343	$ 18,602	$ 94,980	$ 61,300
Effective Income Tax Rate Reconciliation, Percent	36.60%	21.50%	36.90%	29.10%
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities		$ 13,700		$ 13,700
Number of states	19		19
Unrecognized Tax Benefits	$ 54,800		$ 54,800
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range Not Possible			During the next 12 months, it is reasonably possible that our unrecognized tax benefits will change, but we are not able to provide a range of such change.
State and Local Jurisdiction [Member]
Income Taxes (Textual) [Abstract]
Effective Income Tax Rate Reconciliation, Percent			6.60%		6.30%
Deferred Tax Assets, Valuation Allowance	$ 31,400		$ 31,400		$ 31,100