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