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Retirement Plans (Fair Value of Employee Plan Assets) (Details) - Combined Employee Retirement Plans [Member] - USD ($)	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 23,972,000	$ 23,654,000	$ 23,527,000
Managed Investment Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,454,000	1,414,000
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22,495,000	22,240,000
Fair Value, Inputs, Level 1 [Member] | Common Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,323,000	10,080,000
Fair Value, Inputs, Level 1 [Member] | Principal Money Market [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	458,000	799,000
Fair Value, Inputs, Level 1 [Member] | PNC Government Money Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	271,000	175,000
Fair Value, Inputs, Level 1 [Member] | Vanguard INTM Term Investment Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	410,000	250,000
Fair Value, Inputs, Level 1 [Member] | Vanguard LT Investment [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,044,000	1,161,000
Fair Value, Inputs, Level 1 [Member] | Ishares Russell 2000 [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,724,000	1,560,000
Fair Value, Inputs, Level 1 [Member] | Ishares Russell MID-CAP Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,890,000	1,850,000
Fair Value, Inputs, Level 1 [Member] | Ishares Emerging Markets Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,191,000	1,103,000
Fair Value, Inputs, Level 1 [Member] | Ishares MCSI RAFE Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,636,000	1,577,000
Fair Value, Inputs, Level 1 [Member] | Ishares S&P Index [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,091,000	2,252,000
Fair Value, Inputs, Level 1 [Member] | Vanguard INTM Term Treasury [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	410,000	250,000
Fair Value, Inputs, Level 1 [Member] | Vanguard LT Treasury [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,047,000	$ 1,183,000

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-Publisher FASB
-Name Accounting Standards Codification
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