Fair Value (Tables)

3 Months Ended

Dec. 29, 2023

Fair Value Disclosures [Abstract]

Schedule of 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
	December 29, 2023								September 29, 2023
			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)	$	1,029.7	$	1,029.6	$	0.1	$	—	$	718.8	$	718.5	$	0.3	$	—
U.S. Treasury and government securities	17.7		0.4		17.3		—		19.2		—		19.2		—
Corporate bonds and notes	0.2		—		0.2		—		—		—		—		—
Municipal bonds	—		—		—		—		0.5		—		0.5		—
Total assets at fair value	$	1,047.6	$	1,030.0	$	17.6	$	—	$	738.5	$	718.5	$	20.0	$	—

Schedule of 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
	December 29, 2023				September 29, 2023
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
1.80% Senior Notes due 2026	497.9		462.3		497.7		444.5
3.00% Senior Notes due 2031	495.3		430.7		495.2		390.4
Total debt under Senior Notes	$	993.2	$	893.0	$	992.9	$	834.9