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

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Dividend (Detail) - $ / shares										12 Months Ended
Dividend (Detail) - $ / shares	Dec. 23, 2015	Aug. 12, 2015	May. 13, 2015	Feb. 11, 2015	Dec. 16, 2014	Aug. 06, 2014	May. 14, 2014	Feb. 11, 2014	Dec. 17, 2013	Sep. 30, 2015	Sep. 30, 2014
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared		$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.10	$ 0.44	$ 0.43
Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.11