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Concentration of credit risk - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended
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Jul. 31, 2013 | Jul. 31, 2013 Sales Revenue, Goods, Net | Jul. 31, 2012 Sales Revenue, Goods, Net | Jul. 31, 2013 Sales Revenue, Goods, Net | Jul. 31, 2012 Sales Revenue, Goods, Net | Jul. 31, 2013 Accounts Receivable | Oct. 31, 2012 Accounts Receivable | Jul. 31, 2013 Optiflex Customer Concentration Risk | Jul. 31, 2013 Optiflex Customer Concentration Risk
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Excess of federal insured limits | $ 10.0 |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  | 55.00% | 36.00% | 53.00% | 25.00% | 40.00% | 49.00% |  |
Concentration agreement with major customer | 15 years |  |  |  |  |  |  |  |
Sales Revenue, Goods, Net |  |  |  |  |  |  |  | $ 4.3 | $ 10.9

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- Definition Concentration Agreement with Major Customer for past year + References No definition available. + Details
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- Definition Excess of federal insured limits + References No definition available. + Details
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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 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: 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=6927468&loc=d3e6404-108592 Reference 3: 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=28364263&loc=d3e13531-108611 Reference 4: 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=6927468&loc=d3e6351-108592 + Details
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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