Fair Value (Tables)

6 Months Ended

Apr. 01, 2022

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
	April 1, 2022								October 1, 2021
			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*	$	656.4	$	634.6	$	21.8	$	—	$	882.9	$	882.9	$	—	$	—
U.S. Treasury and government securities	10.5		—		10.5		—		13.6		2.6		11.0		—
Corporate bonds and notes	103.4		—		103.4		—		117.0		—		117.0		—
Municipal bonds	7.9		—		7.9		—		13.7		—		13.7		—
Total assets at fair value	$	778.2	$	634.6	$	143.6	$	—	$	1,027.2	$	885.5	$	141.7	$	—

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
	April 1, 2022				October 1, 2021
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
0.90% Senior Notes due 2023	$	498.5	$	489.8	$	498.2	$	501.0
1.80% Senior Notes due 2026	496.4		463.1		496.2		507.5
3.00% Senior Notes due 2031	494.2		448.5		494.0		514.6
Total debt	$	1,489.1	$	1,401.4	$	1,488.4	$	1,523.1