Fair Value Measurements (Tables)

12 Months Ended

Oct. 03, 2021

Sep. 27, 2020

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on A Recurring Basis

Assets and Liabilities Measured at Fair Value on a Recurring Basis (in millions):

			Fair Value Measurements at Reporting Date Using
	Balance at October 3, 2021		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	$	6,455.7	$	6,455.7	$	—	$	—
Short-term investments:
Available-for-sale debt securities
Commercial paper	63.0		—		63.0		—
Corporate debt securities	24.7		—		24.7		—
Mortgage and other asset-backed securities	0.1		—		0.1		—
Total available-for-sale debt securities	87.8		—		87.8		—
Marketable equity securities	74.4		74.4		—		—
Total short-term investments	162.2		74.4		87.8		—
Prepaid expenses and other current assets:
Derivative assets	147.6		131.1		16.5		—
Long-term investments:
Available-for-sale debt securities
Auction rate securities	6.0		—		—		6.0
Corporate debt securities	162.0		—		162.0		—
Foreign government obligations	4.0		—		4.0		—
Mortgage and other asset-backed securities	31.9		—		31.9		—
State and local government obligations	1.5		—		1.5		—
U.S. government treasury securities	76.3		76.3		—		—
Total long-term investments	281.7		76.3		199.4		6.0
Other long-term assets:
Derivative assets	84.3		—		84.3		—
Total assets	$	7,131.5	$	6,737.5	$	388.0	$	6.0
Liabilities:
Accrued liabilities:
Derivative liabilities	$	8.6	$	0.3	$	8.3	$	—
Other long-term liabilities:
Derivative liabilities	8.2		—		8.2		—
Total liabilities	$	16.8	$	0.3	$	16.5	$	—

			Fair Value Measurements at Reporting Date Using
	Balance at September 27, 2020		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	$	4,350.9	$	4,350.9	$	—	$	—
Short-term investments:
Available-for-sale debt securities
Certificates of deposit	1.6		—		1.6		—
Commercial paper	66.8		—		66.8		—
Corporate debt securities	123.6		—		123.6		—
Foreign government obligations	8.5		—		8.5		—
Mortgage and other asset-backed securities	15.8		—		15.8		—
Total available-for-sale debt securities	216.3		—		216.3		—
Marketable equity securities	64.9		64.9		—		—
Total short-term investments	281.2		64.9		216.3		—
Prepaid expenses and other current assets:
Derivative assets	15.6		3.6		12.0		—
Long-term investments:
Available-for-sale debt securities
Auction rate securities	5.7		—		—		5.7
Corporate debt securities	82.6		—		82.6		—
Mortgage and other asset-backed securities	19.3		—		19.3		—
State and local government obligations	3.6		—		3.6		—
U.S. government treasury securities	94.9		94.9		—		—
Total long-term investments	206.1		94.9		105.5		5.7
Other long-term assets:
Derivative assets	87.3		—		87.3		—
Total assets	$	4,941.1	$	4,514.3	$	421.1	$	5.7
Liabilities:
Accrued liabilities:
Derivative liabilities	$	7.3	$	1.9	$	5.4	$	—
Other long-term liabilities:
Derivative liabilities	79.3		0.1		79.2		—
Total	$	86.6	$	2.0	$	84.6	$	—