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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Cash paid during the year for:      
Interest $ 1,121 $ 797 $ 226
Income taxes, net 22,768 $ 22,500 12,493
Supplemental disclosures of non-cash investing activities:      
Additions to property, plant and equipment included in accrued liabilities $ 4   $ 127