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

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 S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ 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=6367179&loc=d3e4304-108586

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- Definition

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

+ References

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Common Stock Dividends (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		0 Months Ended
Common Stock Dividends (Narrative) (Details) (USD $)	Feb. 19, 2015	Apr. 30, 2015	Apr. 30, 2014	Apr. 06, 2015	Jun. 01, 2015
Dividends Payable [Line Items]
Common stock, quarterly dividends, per share, declared	$ 0.49us-gaap_DividendsPayableAmountPerShare
Annual dividend approved by Board of Directors	$ 1.96	$ 1.96	$ 1.92
Dividend Paid [Member]
Dividends Payable [Line Items]
Dividends				Apr. 06, 2015
Subsequent event \| Dividend Paid [Member]
Dividends Payable [Line Items]
Dividends					Jun. 01, 2015