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Retirement Plans (Fair Value of Employee Plan Assets) (Details) - Combined Employee Retirement Plans [Member] - USD ($) | Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 26,429,000 | $ 23,972,000 | $ 23,654,000
Managed Investment Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,912,000 | 1,454,000 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 24,638,000 | 22,495,000 |
Fair Value, Inputs, Level 1 [Member] | Common Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 14,094,000 | 10,323,000 |
Fair Value, Inputs, Level 1 [Member] | Principal Money Market [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 523,000 | 458,000 |
Fair Value, Inputs, Level 1 [Member] | PNC Government Money Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 204,000 | 271,000 |
Fair Value, Inputs, Level 1 [Member] | Vanguard INTM Term Investment Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 394,000 | 410,000 |
Fair Value, Inputs, Level 1 [Member] | Vanguard LT Investment [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 983,000 | 1,044,000 |
Fair Value, Inputs, Level 1 [Member] | Ishares Russell 2000 [Domain] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,457,000 | 1,724,000 |
Fair Value, Inputs, Level 1 [Member] | Ishares Russell MID-CAP Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,958,000 | 1,890,000 |
Fair Value, Inputs, Level 1 [Member] | Ishares Emerging Markets Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,091,000 | 1,191,000 |
Fair Value, Inputs, Level 1 [Member] | Ishares MCSI RAFE Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,713,000 | 1,636,000 |
Fair Value, Inputs, Level 1 [Member] | Ishares S&P Index [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 781,000 | 2,091,000 |
Fair Value, Inputs, Level 1 [Member] | Vanguard INTM Term Treasury [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 404,000 | 410,000 |
Fair Value, Inputs, Level 1 [Member] | Vanguard LT Treasury [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 1,036,000 | $ 1,047,000 |

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