Subsequent Events (Details) (USD $)	3 Months Ended
Aug. 31, 2013	Sep. 18, 2013 Common Class A [Member]
Subsequent Events (Details) [Line Items]
Subsequent Event, Date	Sep. 18, 2013
Subsequent Event Dividend Declared Per Share (in Dollars per share)		$ 0.15

Date the event occurred after the balance sheet date but before financial statements are issues or available to be issued, in CCYY-MM-DD format.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 855

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

Name:	us-gaap_SubsequentEventsDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration