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Fair Value Measurements (Tables)

6 Months Ended

12 Months Ended

Mar. 28, 2021

Sep. 27, 2020

Fair Value Disclosures [Abstract]

Assets And Liabilities Measured At Fair Value On A Recurring Basis

									Fair Value Measurements at Reporting Date Using
			Balance at March 28, 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			$	3,880.7					$	3,880.7					$	—					$	—
Short-term investments:
Available-for-sale debt securities
Commercial paper			38.5						—						38.5						—
Corporate debt securities			14.0						—						14.0						—
State and local government obligations			1.0						—						1.0						—
Total available-for-sale debt securities			53.5						—						53.5						—
Marketable equity securities			69.5						69.5						—						—
Total short-term investments			123.0						69.5						53.5						—
Prepaid expenses and other current assets:
Derivative assets			22.0						13.2						8.8						—
Long-term investments:
Available-for-sale debt securities
Auction rate securities			5.7						—						—						5.7
Corporate debt securities			167.4						—						167.4						—
Foreign government obligations			4.0						—						4.0						—
Mortgage and other asset-backed securities			18.0						—						18.0						—
State and local government obligations			4.1						—						4.1						—
U.S. government treasury securities			85.6						85.6						—						—
Total long-term investments			284.8						85.6						193.5						5.7
Other long-term assets:
Derivative assets			96.1						—						96.1						—
Total assets			$	4,406.6					$	4,049.0					$	351.9					$	5.7
Liabilities:
Accrued liabilities:
Derivative liabilities			$	13.3					$	0.2					$	13.1					$	—
Other long-term liabilities:
Derivative liabilities			13.6						—						13.6						—
Total liabilities			$	26.9					$	0.2					$	26.7					$	—

									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 liabilities			$	86.6					$	2.0					$	84.6					$	—

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- References

No definition available.

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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