Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Effective income tax rate	12.00%	13.00%
Statutory income tax rate	35.00%
Unrecognized tax benefits	$ 8.6
Unrecognized tax benefits that would impact the effective tax rate	8.6
Other long-term liabilities [Member]
Income Tax Contingency [Line Items]
Estimated accrued interest and penalties	$ 2.8