Retirement Plans (Fair Value of Employee Plan Assets) (Details) - Combined Employee Retirement Plans [Member] - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 23,527	$ 27,259	$ 22,911
Managed Investment Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,284	1,336
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22,243	25,923
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 [Member] | Common Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,345	9,701
Fair Value, Inputs, Level 1 [Member] | PNC Government Money Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	630	1,030
Fair Value, Inputs, Level 1 [Member] | Vanguard Total Bond [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 [Member] | Ishares Credit Bond ETF Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	340
Fair Value, Inputs, Level 1 [Member] | Vanguard INTM Term Investment Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	283	702
Fair Value, Inputs, Level 1 [Member] | Vanguard LT Investment [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,304	1,973
Fair Value, Inputs, Level 1 [Member] | Ishares Russell 2000 [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,672	2,047
Fair Value, Inputs, Level 1 [Member] | Ishares MID-CAP Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,890	2,129
Fair Value, Inputs, Level 1 [Member] | Ishares Emerging Markets Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,130	1,338
Fair Value, Inputs, Level 1 [Member] | Ishares MCSI RAFE Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,534	1,838
Fair Value, Inputs, Level 1 [Member] | Ishares S&P Index [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,895	4,825
Fair Value, Inputs, Level 1 [Member] | Vanguard INTM Term Treasury [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	281	0
Fair Value, Inputs, Level 1 [Member] | Vanguard LT Treasury [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,279	$ 0