Long-term and Short-term Debt (Details Textuals 2) - USD ($) $ in Millions	9 Months Ended
Jun. 30, 2015	Sep. 30, 2014
Former Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowing capacity		$ 750.0
New Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowing capacity	$ 1,000.0
Expiration date	Mar. 24, 2020
Option to increase borrowing capacity of credit facility	$ 350.0

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant