Segment Disclosure - Additional information (Detail)	12 Months Ended
	Oct. 31, 2017 Segment Customer	Oct. 31, 2016 Segment Customer	Oct. 31, 2015 Segment Customer
Segment Reporting Information [Line Items]
Number of reportable operating segment | Segment	1	1	1
Number of major customers | Customer	1	1	1
Customer Concentration Risk | Revenues
Segment Reporting Information [Line Items]
Percentage of revenues contributed by major customers	17.90%	15.90%	12.80%