Stock-Based Compensation, (Performance Shares) (Details)	9 Months Ended
Oct. 31, 2015 $ / shares shares
Performance Shares [Member]
Performance Shares [Abstract]
Beginning Balance (in shares)	284,403
Target Shares Granted (in shares)	227,685
Target Shares Forfeited (in shares)	(8,301)
Ending Balance (in shares)	503,787
Performance Share Grant 2012 [Member]
Performance Shares [Abstract]
Target Shares Vested (in shares)	(221,182)
Performance Share Grant 2013 [Member]
Performance Shares [Abstract]
Beginning Balance (in shares)	118,250
Target Shares Forfeited (in shares)	(2,200)
Ending Balance (in shares)	116,050
Weighted Average Grant Date Fair Value per Share (in dollars per share) \| $ / shares	$ 33.81
Performance Share Grant 2014 [Member]
Performance Shares [Abstract]
Beginning Balance (in shares)	166,153
Target Shares Forfeited (in shares)	(2,292)
Ending Balance (in shares)	163,861
Weighted Average Grant Date Fair Value per Share (in dollars per share) \| $ / shares	$ 33.84
Performance Share Grant 2015 [Member]
Performance Shares [Abstract]
Target Shares Granted (in shares)	227,685
Target Shares Forfeited (in shares)	(3,809)
Ending Balance (in shares)	223,876
Weighted Average Grant Date Fair Value per Share (in dollars per share) \| $ / shares	$ 28.33

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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