Stockholders' Equity, Share-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	$ 51.1	$ 53.3
Cost of goods sold
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	7.3	8.8
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	25.6	25.4
Selling, general, and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	$ 18.2	$ 19.1