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Intangible assets (Detail) - USD ($)
$ in Thousands
Jul. 31, 2016
Oct. 31, 2015
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