Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Beginning and Ending Carrying Amounts of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 29, 2025	Jun. 28, 2026	Jun. 29, 2025	Jun. 30, 2024
Goodwill [Roll Forward]
Balance at beginning of period	$ 0.0		$ 359.2
Goodwill impairment	$ 0.0	$ 0.0	(359.2)	$ 0.0
Balance at end of period			$ 0.0	$ 359.2

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details

- Definition

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References + Details