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Fair Value Measurements (Tables)
9 Months Ended
Jun. 30, 2024
Jul. 02, 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
June 30, 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$3,179.1 $3,179.1 $— $— 
Short-term investments:
Available-for-sale debt securities:
Corporate debt securities49.9 — 49.9 — 
Foreign corporate bonds
0.2 — 0.2 — 
Mortgage and other asset-backed securities0.3 — 0.3 — 
State and local government obligations1.4 — 1.4 — 
U.S. government treasury securities18.7 18.7 — — 
Total available-for-sale debt securities70.5 18.7 51.8 — 
Structured deposits55.2 — 55.2 — 
Marketable equity securities86.6 86.6 — — 
Total short-term investments212.3 105.3 107.0 — 
Prepaid expenses and other current assets:
Derivative assets51.6 — 51.6 — 
Long-term investments:
Available-for-sale debt securities:
Corporate debt securities113.9 — 103.1 10.8 
Mortgage and other asset-backed securities54.9 — 54.9 — 
State and local government obligations3.7 — 3.7 — 
U.S. government treasury securities102.1 102.1 — — 
Total available-for-sale debt securities274.6 102.1 161.7 10.8 
Structured deposits0.2 — 0.2 — 
Total long-term investments274.8 102.1 161.9 10.8 
Other long-term assets:
Derivative assets286.2 — 286.2 — 
Total assets$4,004.0 $3,386.5 $606.7 $10.8 
Liabilities:
Accrued liabilities:
Derivative liabilities$3.2 $— $3.2 $— 
Other long-term liabilities:
Derivative liabilities36.9 — 36.9 — 
Total liabilities$40.1 $— $40.1 $— 
  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 securities64.0 — 64.0 — 
U.S. government treasury securities2.8 2.8 — — 
Foreign government obligations3.9 — 3.9 — 
Total available-for-sale debt securities70.7 2.8 67.9 — 
Structured deposits261.2 — 261.2 — 
Marketable equity securities69.6 69.6 — — 
Total short-term investments401.5 72.4 329.1 — 
Prepaid expenses and other current assets:
Derivative assets41.0 — 41.0 — 
Long-term investments:
Available-for-sale debt securities:
Corporate debt securities91.1 — 91.1 — 
Mortgage and other asset-backed securities50.2 — 50.2 — 
State and local government obligations1.3 — 1.3 — 
U.S. government treasury securities104.7 104.7 — — 
Total long-term investments247.3 104.7 142.6 — 
Other long-term assets:
Derivative assets153.0 — 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 liabilities43.2 — 43.2 — 
Total liabilities$46.8 $— $46.8 $—