Fair Value Measurements (Tables)

3 Months Ended

Dec. 28, 2012

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

Fair Value, Assets Measured on Recurring Basis

	September 28, 2012
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets:
Investments held in supplemental retirement plan (1)	$	2,140	$	—	$	—	$	2,140
Money market funds (2)	17,090		—		—		17,090
Commercial paper (2), (3)	—		24,299		—		24,299
Corporate bonds (3)	—		220,236		—		220,236
Municipal debt securities (2), (3)	—		401,648		—		401,648
U.S. agency securities (3)	25,012		—		—		25,012
Total	$	44,242	$	646,183	$	—	$	690,425

Schedule Of Financial Liabilities Carried At Fair Value

	September 28, 2012
	Level 1		Level 2		Level 3		Total
	(in thousands)
Liabilities:
Investments held in supplemental retirement plan (1)	$	2,140	$	—	$	—	$	2,140
Total	$	2,140	$	—	$	—	$	2,140

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