Retirement Plans (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan settlement	$ 65,000	$ 0	$ 285,000	$ 0
Defined benefit plan, actuarial gain			$ 2,059,000
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	1,026,096	893,811	1,026,096	893,811
Contributions by employer	$ 217,000	$ 182,000	$ 608,000	$ 587,000