Derivative Financial Instruments - Additional Information (Details) - USD ($)	6 Months Ended
	Mar. 31, 2016	Sep. 30, 2015
Canadian Dollar Forward Contract
Derivative [Line Items]
Foreign currency forward contract to hedge	$ 3,000,000
Foreign currency forward contract term	90 days
Fair value of contract asset	$ 5,000
Canadian Subsidiary
Derivative [Line Items]
Denominated intercompany accounts payable	28,100,000	$ 28,100,000
Denominated intercompany accounts payable, short-term nature	3,900,000
Denominated intercompany accounts payable, long-term nature	$ 24,200,000