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Retirement Plans (Narrative) (Details) - United States [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2023
Oct. 31, 2022
Oct. 31, 2023
Oct. 31, 2022
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 1,404,774 1,250,468 1,404,774 1,250,468
Contributions by employer $ 356 $ 333 $ 1,078 $ 985