Defined Benefit Pension and Other Postretirement Plans - Narrative (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure
Number of Defined Benefit Plans	1
Pension Benefits
Defined Benefit Plan Disclosure
Expected contribution to pensions plans in the remainder of current fiscal year	$ 10,912
Contribution made to Pension Plan	$ 6,972	$ 6,393

The increase in the fair value of plan assets from contributions made by the employer.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration