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Retirement Plans (Narrative) (Details) - United States [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Minimum annual contributions per employee, percent |  |  | 1.00% |
Maximum annual contributions per employee, percent |  |  | 75.00% |
Number of common shares held | 850,789 | 708,345 | 850,789 | 708,345
Contributions by employer | $ 195 | $ 187 | $ 405 | $ 374

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