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Intangible assets (Detail) - USD ($) $ in Thousands | Jul. 31, 2016 | Oct. 31, 2015
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Intangible Assets [Line Items] |  |
Amortizable intangible assets, net | $ 3,766 | $ 4,268
Non-amortizable intangible assets, trade marks | 1,387 | 1,387
Non-compete agreements (estimated lives 3 - 5 years) |  |
Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 310 | 310
Amortizable intangible assets, accumulated amortization | (264) | (212)
Amortizable intangible assets, net | 46 | 98
Customer relationships (estimated lives 7 - 15 years) |  |
Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 5,099 | 5,099
Amortizable intangible assets, accumulated amortization | (1,509) | (1,101)
Amortizable intangible assets, net | 3,590 | 3,998
Backlog (estimated life 1 year) |  |
Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 134 | 134
Amortizable intangible assets, accumulated amortization | (134) | (100)
Amortizable intangible assets, net | 0 | 34
Patents (estimated life 14 years) |  |
Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 142 | 142
Amortizable intangible assets, accumulated amortization | (12) | (4)
Amortizable intangible assets, net | $ 130 | $ 138

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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