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Short-term Investments - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013 Investments	Sep. 30, 2012	Sep. 30, 2011
Schedule Of Available For Sale Securities [Line Items]
Number of Short-term Investments Outstanding	0
Proceeds from the sale of short-term investments	$ 21,139	$ 2,030
Realized Investment Gains (Losses)	$ 19	$ (1)	$ (27)

The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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