Marketable Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 02, 2026	Oct. 03, 2025
Debt Securities, Available-for-sale [Line Items]
Marketable securities, noncurrent, maximum contractual maturity	2 years
Current assets
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	$ 8.3	$ 212.9
Noncurrent assets
Debt Securities, Available-for-sale [Line Items]
Marketable securities, noncurrent	9.9	14.2
U.S. Treasury and government securities | Current assets
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	6.6	112.4
U.S. Treasury and government securities | Noncurrent assets
Debt Securities, Available-for-sale [Line Items]
Marketable securities, noncurrent	9.9	14.2
Corporate bonds and notes | Current assets
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	1.7	100.5
Corporate bonds and notes | Noncurrent assets
Debt Securities, Available-for-sale [Line Items]
Marketable securities, noncurrent	$ 0.0	$ 0.0