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

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

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Subsequent Events - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended		0 Months Ended
	Nov. 19, 2014	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014	Feb. 11, 2015
Subsequent Event [Line Items]
Cash dividends declared per common share	$ 0.10	$ 0.10	$ 0.10	$ 0.30	$ 0.20
Cash dividend payable date	Feb. 24, 2015
Cash dividends declared, record date	Feb. 06, 2015
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared per common share						$ 0.10
Cash dividend payable date						May 22, 2015
Cash dividends declared, record date						May 08, 2015