Short-Term Investments (Tables)

3 Months Ended

Dec. 31, 2011

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Schedule of cash, cash equivalents and short-term investments

Cash, cash equivalents and short-term investments consist of the following (in thousands):

	December 31, 2011
	Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Cash and cash equivalents	$	167,655	$	7	$	—		$	167,662
Short-term investments:
Available-for-sale securities:
Certificates of deposit	$	2,000	$	2	$	—		$	2,002
International government obligations	2,667		61		(5		)	2,723
Corporate notes and obligations	30,482		215		(1		)	30,696
Total short-term investments	$	35,149	$	278	$	(6	)	$	35,421

	October 1, 2011
	Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Cash and cash equivalents	$	166,931	$	131	$	(1	)	$	167,061
Short-term investments:
Available-for-sale securities:
Certificates of deposit	$	6,500	$	10	$	—		$	6,510
International government obligations	1,101		1		(1		)	1,101
Corporate notes and obligations	45,282		275		(26		)	45,531
Total short-term investments	$	52,883	$	286	$	(27	)	$	53,142

Schedule of amortized cost and estimated fair value of available-for-sale investments in debt securities

The amortized cost and estimated fair value of available-for-sale investments in debt securities as of December 31, 2011 and October 1, 2011 classified as short-term investments on our condensed consolidated balance sheet were as follows (in thousands):

	December 31, 2011				October 1, 2011
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in less than 1 year	$	33,149	$	33,419	$	46,383	$	46,632
Total investments in available-for-sale debt securities	$	33,149	$	33,419	$	46,383	$	46,632