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Noncontrolling interest (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2013
Apr. 30, 2012
Reconciles shareholder's equity attributable to noncontrolling interest related to Salsa Lisa acquisition        
Noncontrolling interest, beginning $ 331 $ 434 $ 357 $ 461
Net loss attributable to noncontrolling interest (20) (13) (46) (40)
Noncontrolling interest, ending $ 311 $ 421 $ 311 $ 421