Non-Operating Expense - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2014	Sep. 30, 2014
Debt Instrument [Line Items]
Pretax charge on unamortized financing costs of credit facility and deferred expense on related interest rate swaps		$ 0.5
Senior unsecured credit facility - revolving loan due 2019
Debt Instrument [Line Items]
Face value	$ 700.0	$ 700.0

For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

Name:	us-gaap_DeferredFinanceCostsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant