Segment Information And Concentrations, Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenue by geographic area	$ 4,178.0	$ 4,772.4	$ 5,485.5
Revenue by sales channel	4,178.0	4,772.4	5,485.5
Distributors
Segment Reporting Information [Line Items]
Revenue by sales channel	3,622.6	4,235.7	4,488.1
Direct customers
Segment Reporting Information [Line Items]
Revenue by sales channel	555.4	536.7	997.4
United States
Segment Reporting Information [Line Items]
Revenue by geographic area	3,202.2	3,603.9	3,685.7
Taiwan
Segment Reporting Information [Line Items]
Revenue by geographic area	317.5	344.4	430.4
China
Segment Reporting Information [Line Items]
Revenue by geographic area	303.4	358.3	599.6
South Korea
Segment Reporting Information [Line Items]
Revenue by geographic area	203.9	198.3	458.2
Europe, Middle East, and Africa
Segment Reporting Information [Line Items]
Revenue by geographic area	114.5	204.2	235.8
Other Asia-Pacific
Segment Reporting Information [Line Items]
Revenue by geographic area	$ 36.5	$ 63.3	$ 75.8