Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009	Oct. 15, 2011 sqft
Commitments And Contingencies [Abstract]
Rent expenses	$ 58.1	$ 49.7	$ 45.2
Number of buildings to be leased				2
Total square feet of buildings				341,000
Total square feet of buildings after enlargement				440,000
Lease initiation date				March 1, 2015
Lease expiration period, (in years)				15
Extended lease term, years				19