Fair Value Measurements (Tables)

9 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value of Assets Measured on Recurring Basis

The following tables provide information by level for financial assets that are measured at fair value on a recurring basis (in thousands):

			Fair Value Measurements at June 30, 2013 using:
	Total carrying value at June 30, 2013		Quoted price in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents:
Money market	$	13,894	$	13,894	$	—	$	—
Available-for-sale marketable securities:
Corporate bonds	36,147		—		36,147		—
Certificates of deposit	10,969		—		10,969		—
Government municipal bonds	10,798		—		10,798		—
Total cash equivalents and marketable securities measured at fair value	$	71,808	$	13,894	$	57,914	$	—

			Fair Value Measurements at September 30, 2012 using:
	Total carrying value at September 30, 2012		Quoted price in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents:
Money market	$	28,355	$	28,355	$	—	$	—
Available-for-sale marketable securities:
Corporate bonds	41,317		—		41,317		—
Commercial paper	2,000		—		2,000		—
Certificates of deposit	7,258		—		7,258		—
Government municipal bonds	9,813		—		9,813		—
Total cash equivalents and marketable securities measured at fair value	$	88,743	$	28,355	$	60,388	$	—