Fair Value of Financial Instruments (Tables)

6 Months Ended

Mar. 31, 2013

Fair Value Measurement of Company's Short-term Investments

The fair value measurement of the Company’s short-term investments and derivative instruments was determined using the following inputs:

	As of March 31, 2013 (in thousands)
				Quoted Prices in		Significant
				Active Markets for		Other			Significant
				Identical Assets		Observable			Unobservable
	Total			(Level 1)		(Level 2)			(Level 3)
Short-term investments:
Corporate bonds	$	7,942		$	7,942	$	—		$	—
Government bonds		2,693			2,693		—			—
Foreign currency forward contract		(252	)		—		(252	)		—
Total	$	10,383		$	10,635	$	(252	)	$	—
	As of September 30, 2012 (in thousands)
				Quoted Prices in		Significant
				Active Markets for		Other			Significant
				Identical Assets		Observable			Unobservable
	Total			(Level 1)		(Level 2)			(Level 3)
Short-term investments:
Corporate bonds	$	11,109		$	11,109	$	—		$	—
Government bonds		8,851			8,851		—			—
Foreign currency forward contract		(215	)		—		(215	)		—
Total	$	19,745		$	19,960	$	(215	)	$	—