Fair Value (Tables)

9 Months Ended

Jun. 27, 2025

Fair Value Disclosures [Abstract]

Fair Value Assets and Liabilities Measured on Recurring Basis

Assets and liabilities recorded at fair value on a recurring basis consisted of the following (in millions):         

	As of
	June 27, 2025								September 27, 2024
			Fair Value Measurements								Fair Value Measurements
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents (1)	$	1,185.9	$	1,127.7	$	58.2	$	—	$	1,368.6	$	1,199.1	$	169.5	$	—
U.S. Treasury and government securities	71.9		51.9		20.0		—		50.1		36.5		13.6		—
Corporate bonds and notes	78.6		—		78.6		—		155.3		—		155.3		—
Municipal bonds	0.3		—		0.3		—		0.1		—		0.1		—
Total assets at fair value	$	1,336.7	$	1,179.6	$	157.1	$	—	$	1,574.1	$	1,235.6	$	338.5	$	—

(1) Cash equivalents included in Levels 1 and 2 consist of money market funds, municipal bonds, corporate bonds and notes, and U.S. Treasury and government securities purchased with less than ninety days until maturity.

Carrying Values and Estimated Fair Values of Debt Instruments

The carrying amount and estimated fair value of debt consists of the following (in millions):

	As of
	June 27, 2025				September 27, 2024
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
1.80% Senior Notes due 2026	$	499.2	$	486.4	$	498.5	$	478.4
3.00% Senior Notes due 2031	496.2		439.4		495.8		441.2
Total debt under Senior Notes	$	995.4	$	925.8	$	994.3	$	919.6