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Retirement Plans (Fair Value of Employee Plan Assets) (Details) - Combined Employee Retirement Plans [Member] - USD ($) | Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 23,654,000 | $ 23,527,000 | $ 27,259,000
Managed Investment Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,414,000 | 1,284,000 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 22,240,000 | 22,243,000 |
Fair Value, Inputs, Level 1 [Member] | Common Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 10,080,000 | 9,345,000 |
Fair Value, Inputs, Level 1 [Member] | Principal Money Market [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 799,000 | 0 |
Fair Value, Inputs, Level 1 [Member] | PNC Government Money Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 175,000 | 630,000 |
Fair Value, Inputs, Level 1 [Member] | Vanguard INTM Term Investment Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 250,000 | 283,000 |
Fair Value, Inputs, Level 1 [Member] | Vanguard LT Investment [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,161,000 | 1,304,000 |
Fair Value, Inputs, Level 1 [Member] | Ishares Russell 2000 [Domain] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,560,000 | 1,672,000 |
Fair Value, Inputs, Level 1 [Member] | Ishares MID-CAP Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,850,000 | 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 | 1,103,000 | 1,130,000 |
Fair Value, Inputs, Level 1 [Member] | Ishares MCSI RAFE Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,577,000 | 1,534,000 |
Fair Value, Inputs, Level 1 [Member] | Ishares S&P Index [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,252,000 | 2,895,000 |
Fair Value, Inputs, Level 1 [Member] | Vanguard INTM Term Treasury [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 250,000 | 281,000 |
Fair Value, Inputs, Level 1 [Member] | Vanguard LT Treasury [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 1,183,000 | $ 1,279,000 |

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