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Stock-Based Compensation (Details) - $ / shares	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Schedule of transactions for stock options under Plan
Outstanding Option Beginning Balance	699,600	616,220	599,406
Options granted	200,346	126,880	116,880
Options exercised	(40,588)	(28,450)	(86,066)
Options cancelled		(15,050)	(14,000)
Outstanding Option Ending Balance	859,358	699,600	616,220
Weighted Average Exercise Price, Beginning Balance	$ 30.41	$ 30.08	$ 26.24
Options granted, Weighted Average Exercise Price	26.97	30.36	41.71
Options exercised, Weighted Average Exercise Price	25.68	21.49	19.75
Options cancelled, Weighted Average Exercise Price		33.32	26.59
Weighted Average Exercise Price, Ending Balance	$ 29.83	$ 30.41	$ 30.08

X

- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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-Topic 210
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