Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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Significant Event (Details) - $ / shares		12 Months Ended
Significant Event (Details) - $ / shares	Feb. 20, 2018	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Subsequent Event [Line Items]
Dividends declared per common share		$ 2.04	$ 2.00	$ 1.96
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends declared per common share	$ 2.08
Common stock, quarterly dividends, per share, declared	$ 0.52