Short-term Investments - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013 Investments
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	$ 3	$ 13	$ 3	$ 30
Number of Short-term Investments Outstanding					0