Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011
Income Taxes (Textual) [Abstract]
Effective tax rate	28.00%	22.60%	28.50%	23.50%
Net decrease in unrecognized tax benefits for the next 12 months, Minimum	$ 0		$ 0
Net decrease in unrecognized tax benefits for the next 12 months, Maximum	$ 48.5		$ 48.5