Investments & Fair Value Measurements (Tables)

6 Months Ended

Mar. 27, 2015

Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]

Schedule Of Financial Assets and Liabilities Carried At Fair Value

The following table summarizes unrealized gains and losses on our cash and investment portfolio and our financial assets and liabilities measured at fair value on a recurring basis (in thousands):

	March 27, 2015
	Cost		Unrealized							Estimated Fair Value
			Gains		Losses			Total		Level 1		Level 2		Level 3
Cash and cash equivalents:
Cash	$	498,556						$	498,556
Cash equivalents:
Money market funds	15,438		—		—			15,438		15,438
Cash and cash equivalents	513,994		—		—			513,994		15,438		—		—
Short-term investments:
Government bonds	1,999		7		—			2,006		2,006
Commercial paper	3,999		—		—			3,999				3,999
Corporate bonds	79,485		86		(15		)	79,556				79,556
Municipal debt securities	102,480		129		(6		)	102,603				102,603
Short-term investments	187,963		222		(21		)	188,164		2,006		186,158		—
Long-term investments:
U.S. agency securities	5,000		6		—			5,006		5,006
Government bonds	20,290		4		(33		)	20,261		20,261
Corporate bonds	144,666		376		(22		)	145,020				145,020
Municipal debt securities	158,079		236		(54		)	158,261				158,261
Other long-term investments (1)	1,750		—		—			1,750		1,050				700
Long-term investments	329,785		622		(109		)	330,298		26,317		303,281		700
Total cash, cash equivalents, and investments	$	1,031,742	$	844	$	(130	)	$	1,032,456	$	43,761	$	489,439	$	700
Investments held in supplemental retirement plan:
Assets	2,560		—		—			2,560		2,560
Included in prepaid expenses and other current assets & other non-current assets
Liabilities	2,560		—		—			2,560		2,560
Included in accrued liabilities & other non-current liabilities
Contingent consideration related to acquisition:
Liabilities	740		—		—			740						740
Included in accrued liabilities

(1) Other long-term investments as of March 27, 2015 include a marketable equity security of $1.1 million and cost method investments of $0.7 million.

	September 26, 2014
	Cost		Unrealized							Estimated Fair Value
			Gains		Losses			Total		Level 1		Level 2		Level 3
Cash and cash equivalents:
Cash	$	564,745						$	564,745
Cash equivalents:
Money market funds	1,727		—		—			1,727		1,727
Commercial paper	2,000		—		—			2,000				2,000
Cash and cash equivalents	568,472		—		—			568,472		1,727		2,000		—
Short-term investments:
U.S. agency securities	35,443		5		(3		)	35,445		35,445
Commercial paper	21,788		—		—			21,788				21,788
Corporate bonds	56,106		81		(10		)	56,177				56,177
Municipal debt securities	117,606		197		(5		)	117,798				117,798
Short-term investments	230,943		283		(18		)	231,208		35,445		195,763		—
Long-term investments:
U.S. agency securities	31,980		19		(6		)	31,993		31,993
Corporate bonds	117,063		226		(80		)	117,209				117,209
Municipal debt securities	146,337		326		(30		)	146,633				146,633
Other long-term investments (1)	500		—		—			500
Long-term investments	295,880		571		(116		)	296,335		31,993		263,842		—
Total cash, cash equivalents, and investments	$	1,095,295	$	854	$	(134	)	$	1,096,015	$	69,165	$	461,605	$	—
Investments held in supplemental retirement plan:
Assets	2,507		—		—			2,507		2,507
Included in prepaid expenses and other current assets & other non-current assets
Liabilities	2,507		—		—			2,507		2,507
Included in accrued liabilities & other non-current liabilities

(1) Other long-term investments as of September 26, 2014 include a cost method investment of $0.5 million.

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value

The following table presents the gross unrealized losses and fair value for those available-for-sale securities that were in an unrealized loss position as of March 27, 2015 and September 26, 2014 (in thousands):

	March 27, 2015					September 26, 2014
Investment Type	Fair Value		Gross Unrealized Losses (1)			Fair Value		Gross Unrealized Losses (1)
U.S. agency securities	$	17,758	$	(33	)	$	31,930	$	(9	)
Corporate bonds	64,387		(37		)	78,166		(90		)
Municipal debt securities	47,479		(60		)	55,979		(35		)
Total	$	129,624	$	(130	)	$	166,075	$	(134	)

(1) Our available-for-sale securities in an unrealized loss position were in such position for less than twelve months as of both March 27, 2015 and September 26, 2014.

Available-for-sale Securities

The following table summarizes the amortized cost and estimated fair value of the available-for-sale securities within our investment portfolio based on stated maturities as of March 27, 2015 and September 26, 2014, which are recorded within cash equivalents and both short and long-term investments in our consolidated balance sheets (in thousands):

	March 27, 2015				September 26, 2014
Range of maturity	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due within 1 year	$	187,963	$	188,164	$	232,944	$	233,208
Due in 1 to 2 years	207,097		207,445		179,177		179,536
Due in 2 to 3 years	120,938		121,103		116,204		116,299
Total	$	515,998	$	516,712	$	528,325	$	529,043