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Retirement Plans (Narrative) (Details) - United States [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2020 | Oct. 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 | 893,811 | 710,319 | 893,811 | 710,319
Contributions by employer | $ 182 | $ 204 | $ 587 | $ 578

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