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Retirement Plans (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2022 | Jul. 31, 2021 | Jul. 31, 2022 | Jul. 31, 2021
Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Plan settlement | $ 0 | $ 220 | $ 0 | $ 220
United States [Member] |  |  |  |
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 | 1,221,095 | 991,899 | 1,221,095 | 991,899
Contributions by employer | $ 322 | $ 207 | $ 652 | $ 391

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