COMMON STOCK REPURCHASES (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Apr. 30, 2015
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased (in shares)	700,003
Average price per share (in usd per share)	$ 78.85
Additional Paid-in Capital
Equity, Class of Treasury Stock [Line Items]
Impact on equity	$ 40.5
Retained Earnings
Equity, Class of Treasury Stock [Line Items]
Impact on equity	$ 14.0

The average cost of shares repurchased and retired in the period.

No definition available.

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

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