Retirement Plans (Fair Value of Employee Plan Assets) (Details) - Combined Employee Retirement Plans [Member] - USD ($)	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 23,628,000	$ 26,429,000	$ 23,972,000
Managed Investment Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,200,000	1,900,000
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21,473,000	24,638,000
Fair Value, Inputs, Level 1 [Member] | Common Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,389,000	14,094,000
Fair Value, Inputs, Level 1 [Member] | Principal Money Market [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	233,000	523,000
Fair Value, Inputs, Level 1 [Member] | Federated Herme Gove Oblig
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	722,000	0
Fair Value, Inputs, Level 1 [Member] | PNC Government Money Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	204,000
Fair Value, Inputs, Level 1 [Member] | Vanguard INTM Term Investment Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	930,000	394,000
Fair Value, Inputs, Level 1 [Member] | Vanguard LT Investment [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,382,000	983,000
Fair Value, Inputs, Level 1 [Member] | Ishares Russell 2000 [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	718,000	1,457,000
Fair Value, Inputs, Level 1 [Member] | Ishares Russell MID-CAP Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	738,000	1,958,000
Fair Value, Inputs, Level 1 [Member] | Ishares Emerging Markets Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	748,000	1,091,000
Fair Value, Inputs, Level 1 [Member] | Ishares MCSI RAFE Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,857,000	1,713,000
Fair Value, Inputs, Level 1 [Member] | Ishares S&P Index [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	483,000	781,000
Fair Value, Inputs, Level 1 [Member] | Vanguard INTM Term Treasury [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,352,000	404,000
Fair Value, Inputs, Level 1 [Member] | Vanguard LT Treasury [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 921,000	$ 1,036,000