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Mexican IVA taxes receivable (Details) - USD ($)
$ in Thousands
Jan. 31, 2018
Oct. 31, 2017
Value Added Tax Receivable [Abstract]    
IVA receivables balance $ 21,200 $ 19,500
Mexican IVA (i.e. value-added) tax receivable recorded in other assets $ 19,750 $ 18,174