Fair Value Measurements (Tables)

3 Months Ended

Dec. 31, 2023

Jan. 01, 2023

Fair Value Disclosures [Abstract]

Assets And Liabilities Measured At Fair Value On A Recurring Basis

			Fair Value Measurements at Reporting Date Using
	Balance at December 31, 2023		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	$	3,000.4	$	3,000.4	$	—	$	—
Short-term investments:
Available-for-sale debt securities
Corporate debt securities	65.1		—		65.1		—
U.S. government treasury securities	10.4		10.4		—		—
Foreign government obligations	4.0		—		4.0		—
Mortgage and other asset-backed securities	0.3		—		0.3		—
Total available-for-sale debt securities	79.8		10.4		69.4		—
Structured deposits	225.5		—		225.5		—
Marketable equity securities	77.7		77.7		—		—
Total short-term investments	383.0		88.1		294.9		—
Prepaid expenses and other current assets:
Derivative assets	37.2		—		37.2		—
Long-term investments:
Available-for-sale debt securities
Corporate debt securities	89.2		—		78.9		10.3
Mortgage and other asset-backed securities	50.0		—		50.0		—
State and local government obligations	1.4		—		1.4		—
U.S. government treasury securities	99.2		99.2		—		—
Total long-term investments	239.8		99.2		130.3		10.3
Other long-term assets:
Derivative assets	119.2		—		119.2		—
Structured deposits	0.1		—		0.1		—
Total assets	$	3,779.7	$	3,187.7	$	581.7	$	10.3
Liabilities:
Accrued liabilities:
Derivative liabilities	$	10.5	$	—	$	10.5	$	—
Other long-term liabilities:
Derivative liabilities	38.4		—		38.4		—
Total liabilities	$	48.9	$	—	$	48.9	$	—

			Fair Value Measurements at Reporting Date Using
	Balance at October 1, 2023		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	$	3,551.5	$	3,551.5	$	—	$	—
Short-term investments:
Available-for-sale debt securities
Corporate debt securities	64.0		—		64.0		—
U.S. government treasury securities	2.8		2.8		—		—
Foreign government obligations	3.9		—		3.9		—
Total available-for-sale debt securities	70.7		2.8		67.9		—
Structured deposits	261.2		—		261.2		—
Marketable equity securities	69.6		69.6		—		—
Total short-term investments	401.5		72.4		329.1		—
Prepaid expenses and other current assets:
Derivative assets	41.0		—		41.0		—
Long-term investments:
Available-for-sale debt securities
Corporate debt securities	91.1		—		91.1		—
Mortgage and other asset-backed securities	50.2		—		50.2		—
State and local government obligations	1.3		—		1.3		—
U.S. government treasury securities	104.7		104.7		—		—
Total long-term investments	247.3		104.7		142.6		—
Other long-term assets:
Derivative assets	153.0		—		153.0		—
Total assets	$	4,394.3	$	3,728.6	$	665.7	$	—
Liabilities:
Accrued liabilities:
Derivative liabilities	$	3.6	$	—	$	3.6	$	—
Other long-term liabilities:
Derivative liabilities	43.2		—		43.2		—
Total liabilities	$	46.8	$	—	$	46.8	$	—