Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Millions	Jun. 28, 2026	Sep. 29, 2025	Jun. 29, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross receivables	$ 98.2		$ 179.6
Allowance for credit losses	0.0		(0.8)
Accounts receivable, net	98.2	$ 155.6	178.8
Royalties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross receivables	1.2		0.7
Billed trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross receivables	96.9		176.1
Unbilled contract receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross receivables	$ 0.1		$ 2.8

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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