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Retirement Plans (Narrative) (Details) - United States [Member] - USD ($) $ in Thousands	3 Months Ended
	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

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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