Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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- Definition

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

+ References

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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.

+ References

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- Definition

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

+ References

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- Definition

Benefit of average compensation years.

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- Definition

Defined Contribution Plan, Annual Contributions Per Employee, Percent

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- Definition

Defined Contribution Plan, Number of Common Shares Held

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Retirement Plans (Narrative) (Details) - USD ($)		3 Months Ended		6 Months Ended
Retirement Plans (Narrative) (Details) - USD ($)	Dec. 31, 2003	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
United States [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Maximum annual contributions per employee, percent				75.00%
Number of common shares held		708,345	608,928	708,345	608,928
Contributions by employer		$ 187,000	$ 179,000	$ 374,000	$ 363,000
United States [Member] \| Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual contributions per employee, percent				1.00%
VIP Retirement Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Rate of compensation increase				50.00%
Benefit of average compensation years	5 years