Segment Disclosure (Narrative) (Details)	3 Months Ended		6 Months Ended
	Apr. 30, 2012 customer segment	Apr. 30, 2011 customer segment	Apr. 30, 2012 segment customer	Apr. 30, 2011 segment customer
Segment Disclosure [Abstract]
Number of reportable operating segment	1	1	1	1
Number of major customers	1	1	1	1
Percentage of revenues contributed by major customers	10.10%	10.10%	10.30%	10.50%