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Retirement Plans (Fair Value of Employee Plan Assets) (Details) - Employee Plan [Member] - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 27,259	$ 22,911	$ 19,848
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,701	7,379
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	9,701	7,379
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,558	15,532
Fair Value, Inputs, Level 2 [Member] | PNC Government Money Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,030	856
Fair Value, Inputs, Level 2 [Member] | Vanguard Total Bond [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	1,144
Fair Value, Inputs, Level 2 [Member] | Ishares Credit Bond ETF Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	340	172
Fair Value, Inputs, Level 2 [Member] | Vanguard INTM Term Investment Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	702	346
Fair Value, Inputs, Level 2 [Member] | Vanguard LT Investment [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,973	0
Fair Value, Inputs, Level 2 [Member] | Ishares Russell 2000 [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,047	1,771
Fair Value, Inputs, Level 2 [Member] | Ishares MID-CAP Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,129	1,817
Fair Value, Inputs, Level 2 [Member] | Ishares Emerging Markets Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,338	1,110
Fair Value, Inputs, Level 2 [Member] | Ishares MCSI RAFE Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,838	1,553
Fair Value, Inputs, Level 2 [Member] | Ishares S&P Index [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,825	0
Fair Value, Inputs, Level 2 [Member] | Vanguard REIT Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	913
Fair Value, Inputs, Level 2 [Member] | Blackrock S&P Index [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	4,643
Fair Value, Inputs, Level 2 [Member] | Managed Investment Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,336	$ 1,207

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+ References

No definition available.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6520858

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