Fair Value Measurements (Tables)

9 Months Ended

Jun. 29, 2025

Jun. 30, 2024

Fair Value Disclosures [Abstract]

Assets And Liabilities Measured At Fair Value On A Recurring Basis

			Fair Value Measurements at Reporting Date Using
	Balance at June 29, 2025		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant  Other Observable Inputs (Level 2)		Significant Unobservable  Inputs (Level 3)
Assets:
Cash and cash equivalents	$	4,172.6	$	4,172.6	$	—	$	—
Short-term investments:
Available-for-sale debt securities:
Corporate debt securities	68.3		—		56.6		11.7
Mortgage and other asset-backed securities	0.4		—		0.4		—
State and local government obligations	1.1		—		1.1		—
U.S. government treasury securities	90.8		90.8		—		—
Total available-for-sale debt securities	160.6		90.8		58.1		11.7
Structured deposits	84.0		—		84.0		—
Marketable equity securities	88.7		88.7		—		—
Total short-term investments	333.3		179.5		142.1		11.7
Prepaid expenses and other current assets:
Derivative assets	9.7		—		9.7		—
Long-term investments:
Available-for-sale debt securities:
Corporate debt securities	120.6		—		94.7		25.9
Mortgage and other asset-backed securities	74.7		—		74.7		—
State and local government obligations	2.7		—		2.7		—
U.S. government treasury securities	34.0		34.0		—		—
Total available-for-sale debt securities	232.0		34.0		172.1		25.9
Total long-term investments	232.0		34.0		172.1		25.9
Other long-term assets:
Derivative assets	187.0		—		187.0		—
Total assets	$	4,934.6	$	4,386.1	$	510.9	$	37.6
Liabilities:
Accrued liabilities:
Derivative liabilities	$	6.4	$	—	$	6.4	$	—
Other long-term liabilities:
Derivative liabilities	31.1		—		31.1		—
Total liabilities	$	37.5	$	—	$	37.5	$	—

			Fair Value Measurements at Reporting Date Using
	Balance at September 29, 2024		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable  Inputs (Level 3)
Assets:
Cash and cash equivalents	$	3,286.2	$	3,286.2	$	—	$	—
Short-term investments:
Available-for-sale debt securities:
Corporate debt securities	51.8		—		51.8		—
Foreign corporate bonds	0.2		—		0.2		—
Mortgage and other asset-backed securities	0.4		—		0.4		—
State and local government obligations	1.4		—		1.4		—
U.S. government treasury securities	36.9		36.9		—		—
Total available-for-sale debt securities	90.7		36.9		53.8		—
Structured deposits	84.1		—		84.1		—
Marketable equity securities	82.2		82.2		—		—
Total short-term investments	257.0		119.1		137.9		—
Prepaid expenses and other current assets:
Derivative assets	8.7		—		8.7		—
Long-term investments:
Available-for-sale debt securities:
Corporate debt securities	112.8		—		101.8		11.0
Mortgage and other asset-backed securities	64.4		—		64.4		—
State and local government obligations	3.7		—		3.7		—
U.S. government treasury securities	94.9		94.9		—		—
Total available-for-sale debt securities	275.8		94.9		169.9		11.0
Structured deposits	0.2		—		0.2		—
Total long-term investments	276.0		94.9		170.1		11.0
Other long-term assets:
Derivative assets	179.1		—		179.1		—
Total assets	$	4,007.0	$	3,500.2	$	495.8	$	11.0
Liabilities:
Accrued liabilities:
Derivative liabilities	$	29.2	$	—	$	29.2	$	—
Other long-term liabilities:
Derivative liabilities	56.7		—		56.7		—
Total liabilities	$	85.9	$	—	$	85.9	$	—