Fair Value Measurements (Tables)

6 Months Ended

Mar. 30, 2012

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

Fair Value, Assets Measured on Recurring Basis



	March 30, 2012
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets:
Investments held in supplemental retirement plan (1)	$	2,137	$	—	$	—	$	2,137
Money market funds (2)	264,366		—		—		264,366
Commercial paper (3)	—		20,984		—		20,984
Corporate bonds (4)	—		125,092		—		125,092
Municipal debt securities (4)	—		389,371		—		389,371
U.S. agency securities (4)	25,092		—		—		25,092
Total	$	291,595	$	535,447	$	—	$	827,042


(1)	These assets are included within prepaid expenses and other current assets and within other non-current assets.


(2)	These assets are included within cash and cash equivalents.


(3)	These assets are included within short-term investments.


(4)	These assets are included within short-term investments and within long-term investments.



	September 30, 2011
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets:
Investments held in supplemental retirement plan (1)	$	1,891	$	—	$	—	$	1,891
Money market funds (2)	142,038		—		—		142,038
Corporate bonds (3)	—		176,958		—		176,958
Municipal debt securities (3)	—		472,201		—		472,201
U.S. agency securities (2), (3)	29,919		—		—		29,919
Total	$	173,848	$	649,159	$	—	$	823,007


(1)	These assets are included within prepaid expenses and other current assets and within other non-current assets.


(2)	These assets are included within cash and cash equivalents.


(3)	These assets are included within short-term investments and within long-term investments.

Schedule Of Financial Liabilities Carried At Fair Value



	March 30, 2012
	Level 1		Level 2		Level 3		Total
	(in thousands)
Liabilities:
Investments held in supplemental retirement plan (1)	$	2,137	$	—	$	—	$	2,137
Total	$	2,137	$	—	$	—	$	2,137


(1)	These liabilities are included within accrued compensation and benefits and within other non-current liabilities



	September 30, 2011
	Level 1		Level 2		Level 3		Total
	(in thousands)
Liabilities:
Investments held in supplemental retirement plan (1)	$	1,891	$	—	$	—	$	1,891
Total	$	1,891	$	—	$	—	$	1,891


(1)	These liabilities are included within accrued compensation and benefits and within other non-current liabilities.

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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- Definition

Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

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