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Interest expense, net (Tables) | 9 Months Ended
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Oct. 31, 2017
Interest Income (Expense), Net [Abstract] |
Interest income and interest expense [Table Text Block] |
| Three Months Ended October 31, | Nine Months Ended October 31,
| 2017 |  | 2016 |  | 2017 |  | 2016 |
Interest expense |  | $225 |  |  | $164 |  |  | $583 |  |  | $556 |
Interest income | (32 | ) | (52 | ) | (76 | ) | (121 | )
Interest expense, net |  | $193 |  |  | $112 |  |  | $507 |  |  | $435 |

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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