Retirement Plans (Fair Value of Employee Plan Assets) (Details) - Employee Plan [Member] - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 22,911	$ 19,848	$ 21,187
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,379	5,831
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	7,379	5,831
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15,532	14,017
Fair Value, Inputs, Level 2 [Member] | PNC Government Money Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	856	1,087
Fair Value, Inputs, Level 2 [Member] | Vanguard Total Bond [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,144	3,478
Fair Value, Inputs, Level 2 [Member] | Ishares Russell 2000 [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,771	1,276
Fair Value, Inputs, Level 2 [Member] | Vanguard All World [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	1,668
Fair Value, Inputs, Level 2 [Member] | Blackrock S&P Index [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,643	5,410
Fair Value, Inputs, Level 2 [Member] | Ishares Credit Bond ETF Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	172	0
Fair Value, Inputs, Level 2 [Member] | Vanguard INTM Term Investment Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	346	0
Fair Value, Inputs, Level 2 [Member] | Ishares MID-CAP Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,817	0
Fair Value, Inputs, Level 2 [Member] | Ishares Emerging Markets Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,110	0
Fair Value, Inputs, Level 2 [Member] | Ishares MCSI RAFE Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,553	0
Fair Value, Inputs, Level 2 [Member] | Vanguard REIT Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	913	0
Fair Value, Inputs, Level 2 [Member] | Managed Investment Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,207	$ 1,098