Derivative Financial Instruments - Additional Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013
Derivative Financial Instruments [Line Items]
Accrued unrealized foreign exchange losses	$ 0.1
Foreign Currency Forward Contracts
Derivative Financial Instruments [Line Items]
Foreign currency forward contract to hedge	35.0
Canadian Subsidiary
Derivative Financial Instruments [Line Items]
Denominated intercompany accounts payable	$ 50.0