Segment Disclosure - Additional information (Detail)	3 Months Ended		6 Months Ended
	Apr. 30, 2015 Segment Customer	Apr. 30, 2014 Customer Segment	Apr. 30, 2015 Customer Segment	Apr. 30, 2014 Customer Segment
Segment Reporting Information [Line Items]
Number of reportable operating segment	1	1	1	1
Number of major customers	1	1	1	1
Customer concentration risk | Revenues
Segment Reporting Information [Line Items]
Percentage of revenues contributed by major customers	12.30%	10.00%	11.80%	10.80%