Stock-Based Compensation (Details 1) (USD $)	12 Months Ended
Jan. 31, 2015
Schedule of outstanding and exercisable stock options
Number Outstanding	616,220
Weighted Average Remaining Contractual Life (years)	5 years 1 month 6 days
Outstanding stock options, weighted Average Exercise Price	$ 30.08
Number Exercisable	164,800
Exercisable stock options , weighted Average Exercise Price	$ 26.44
Range One
Schedule of outstanding and exercisable stock options
Minimum Range of Exercise Price	$ 18.03
Maximum Range of Exercise Price	$ 21.02
Number Outstanding	24,550
Weighted Average Remaining Contractual Life (years)	10 months 24 days
Outstanding stock options, weighted Average Exercise Price	$ 19.18
Number Exercisable	24,550
Exercisable stock options , weighted Average Exercise Price	$ 19.18
Range Two
Schedule of outstanding and exercisable stock options
Minimum Range of Exercise Price	$ 21.03
Maximum Range of Exercise Price	$ 24.02
Number Outstanding	68,750
Weighted Average Remaining Contractual Life (years)	3 years 2 months 12 days
Outstanding stock options, weighted Average Exercise Price	$ 22.29
Number Exercisable	68,750
Exercisable stock options , weighted Average Exercise Price	$ 22.29
Range Three
Schedule of outstanding and exercisable stock options
Minimum Range of Exercise Price	$ 24.03
Maximum Range of Exercise Price	$ 27.02
Number Outstanding	228,100
Weighted Average Remaining Contractual Life (years)	7 years 2 months 12 days
Outstanding stock options, weighted Average Exercise Price	$ 26.59
Range Four
Schedule of outstanding and exercisable stock options
Minimum Range of Exercise Price	$ 27.03
Maximum Range of Exercise Price	$ 32.92
Number Outstanding	294,820
Weighted Average Remaining Contractual Life (years)	7 years 2 months 12 days
Outstanding stock options, weighted Average Exercise Price	$ 35.47
Number Exercisable	71,500
Exercisable stock options , weighted Average Exercise Price	$ 32.92

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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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)(iii)

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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-Publisher FASB

-Name Accounting Standards Codification

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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