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Concentrations of credit risk - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2015 | Oct. 31, 2014
Concentration Risk [Line Items] |  |
Cash, FDIC insured amount | $ 6.4 |
Concentration agreement with major customer | 15 years |
Sales Revenue, Goods, Net |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 18.00% | 34.00%
Accounts Receivable |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 17.00% | 22.00%
Optiflex Customer Concentration Risk |  |
Concentration Risk [Line Items] |  |
Sales revenue, goods, net |  | $ 2.5
Sales Revenue, Net [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage |  | 11.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
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