Segment Disclosure - Additional information (Detail)	3 Months Ended		9 Months Ended
	Jul. 31, 2012 Customer	Jul. 31, 2011 Customer	Jul. 31, 2012 Customer Segment	Jul. 31, 2011 Customer
Segment Reporting Information [Line Items]
Number of reportable operating segment			1
Number of major customers	1	1	1	1
Percentage of revenues contributed by major customers	10.80%	10.50%	10.50%	10.50%