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Investments (Tables)
 6 Months Ended
Mar. 29, 2024
Investments, Debt and Equity Securities [Abstract]  
Summary of Contractual Maturities of Investments
The contractual maturities of available-for-sale investments were as follows (in thousands):
 March 29, 2024September 29, 2023
Less than one year$219,861 $265,591 
Over one year141,562 74,983 
Total available-for-sale investments$361,423 $340,574 
Debt Securities, Available-for-sale The amortized cost, gross unrealized holding gains or losses and fair value of our available-for-sale investments by major investment type are summarized in the tables below (in thousands):
 March 29, 2024
 Amortized
Cost		Gross
Unrealized
Holding Gains 		Gross
Unrealized
Holding Losses		Aggregate Fair
Value
Certificates of deposit$10,980 $1 $— $10,981 
Corporate bonds243,039 36 (1,615)241,460 
Commercial paper48,589 — (60)48,529 
U.S. Treasuries and agency bonds60,460 75 (82)60,453 
Total short-term investments$363,068 $112 $(1,757)$361,423 
September 29, 2023
 Amortized
Cost		Gross
Unrealized
Holding Gains 		Gross
Unrealized
Holding Losses		Aggregate Fair
Value
Corporate bonds$145,234 $— $(2,845)$142,389 
Commercial paper176,405 — (129)176,276 
U.S. Treasuries and agency bonds21,895 18 (4)21,909 
Total short-term investments$343,534 $18 $(2,978)$340,574