Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Consolidated Statements of Shareholders' Equity
Dividends declared, per share (in dollars per share)	$ 2.75	$ 2.625	$ 1.3

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