Income Taxes - Tabular Disclosure of Income (Loss) Before Income Tax Between Domestic and Foreign Jurisdictions (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 29, 2019
Income Loss From Operations Before Provision Benefit For Income Taxes [Line Items]
Income/(loss) before provision for income taxes	$ 120.1	$ 159.4	$ (20.8)
United States [Member]
Income Loss From Operations Before Provision Benefit For Income Taxes [Line Items]
Income/(loss) before provision for income taxes	(21.0)	(13.5)	(40.6)
Foreign [Member]
Income Loss From Operations Before Provision Benefit For Income Taxes [Line Items]
Income/(loss) before provision for income taxes	$ 141.1	$ 172.9	$ 19.8