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Concentration of credit risk - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	3 Months Ended		6 Months Ended			12 Months Ended	3 Months Ended	6 Months Ended
	Apr. 30, 2013	Apr. 30, 2013 Sales Revenue, Goods, Net	Apr. 30, 2012 Sales Revenue, Goods, Net	Apr. 30, 2013 Sales Revenue, Goods, Net	Apr. 30, 2012 Sales Revenue, Goods, Net	Apr. 30, 2013 Accounts Receivable	Oct. 31, 2012 Accounts Receivable	Apr. 30, 2013 Optiflex Customer Concentration Risk	Apr. 30, 2013 Optiflex Customer Concentration Risk
Concentration Risk [Line Items]
Excess of federal insured limits	$ 7.7
Concentration Risk, Percentage		50.00%	14.00%	52.00%	14.00%	41.00%	49.00%	33.00%	34.00%
Concentration agreement with major customer	15 years
Sales Revenue, Goods, Net								$ 3.0	$ 6.6

X

- Definition

Concentration Agreement with Major Customer for past year

+ References

No definition available.

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X

- Definition

Excess of federal insured limits

+ References

No definition available.

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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=6927468&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 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611



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=6927468&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 20

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611

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X

- 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=6880815&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

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