Short-Term Investments (Tables)

12 Months Ended

Oct. 03, 2015

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

Schedule of cash, cash equivalents and short-term investments

	Fiscal Year-end September 27, 2014
	Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Cash and cash equivalents	$	91,217	$	—	$	—		$	91,217
Short-term investments:
Available-for-sale securities:
Commercial paper	$	23,983	$	—	$	—		$	23,983
U.S. Treasury and agency obligations	149,260		831		(3		)	150,088
Corporate notes and obligations	52,834		195		(42		)	52,987
Total short-term investments	$	226,077	$	1,026	$	(45	)	$	227,058

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

	Fiscal Year-end October 3, 2015
	Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Cash and cash equivalents	$	130,607	$	—	$	—		$	130,607
Short-term investments:
Available-for-sale securities:
Commercial paper	$	9,740	$	—	$	—		$	9,740
U.S. Treasury and agency obligations	149,708		1,040		—			150,748
Corporate notes and obligations	17,892		52		(2		)	17,942
Equity securities	15,269		1,209		—			16,478
Total short-term investments	$	192,609	$	2,301	$	(2	)	$	194,908

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

None of the unrealized losses as of October 3, 2015 or September 27, 2014 were considered to be other-than-temporary impairments.

The amortized cost and estimated fair value of available-for-sale investments in debt securities as of October 3, 2015 and September 27, 2014, classified as short-term investments on our consolidated balance sheets, were as follows (in thousands):

	Fiscal Year-end
	2015				2014
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Investments in available-for-sale debt securities due in less than one year	$	148,088	$	149,100	$	178,329	$	179,223
Investments in available-for-sale debt securities due in one to five years (1)	$	29,252	$	29,330	$	47,748	$	47,835