Fair Value of Financial Instruments (Tables)

9 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurement of Company's Short-term Investments and Derivative Instruments

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

	As of June 30, 2015
			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	$	16,152	$	16,152	$	—	$	—
Government bonds		3,458		3,458		—		—
Foreign currency forward contract		28		—		28		—
Total	$	19,638	$	19,610	$	28	$	—

	As of September 30, 2014
			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	$	14,235	$	14,235	$	—	$	—
Government bonds		5,626		5,626		—		—
Foreign currency forward contract		795		—		795		—
Total	$	20,656	$	19,861	$	795	$	—