Segment Disclosure - Additional information (Detail)	3 Months Ended		6 Months Ended
	Apr. 30, 2016 Segment Customer	Apr. 30, 2015 Segment Customer	Apr. 30, 2016 Segment Customer	Apr. 30, 2015 Segment Customer
Segment Reporting Information [Line Items]
Number of reportable operating segment | Segment	1	1	1	1
Number of major customers | Customer	1	1	1	1
Customer concentration risk | Revenues
Segment Reporting Information [Line Items]
Percentage of revenues contributed by major customers	14.50%	12.30%	13.80%	11.80%