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Retirement Plans (Narrative) (Details) - United States [Member] - USD ($) $ in Thousands | 3 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020
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 | 970,632 | 763,586
Contributions by employer | $ 184 | $ 210

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