Derivative Financial Instruments - Additional Information (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2014
Derivative Financial Instruments [Line Items]
Accrued unrealized foreign exchange losses	$ 0.5
Foreign Currency Exchange Contracts
Derivative Financial Instruments [Line Items]
Foreign currency forward contract to hedge	30.0
Canadian Subsidiary
Derivative Financial Instruments [Line Items]
Denominated intercompany accounts payable	$ 34.8