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Income Taxes - Provision for Income Taxes Differs from Federal Statutory Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Provision at U.S. federal statutory tax rate	$ 33.5	$ (4.4)	$ (22.9)
Non-deductible share-based compensation	3.0	4.0	4.9
Shortfall related to share-based compensation	2.1	3.3	4.1
Non-deductible officer compensation	1.9	1.1
Business credits	(6.1)	(6.1)	(4.9)
Foreign tax differential	4.9	1.0	16.5
Nondeductible amortization		0.7	1.2
Taxes associated with one-time transition tax			44.1
Impact of corporate tax rate change on deferred taxes			(2.7)
Other differences	(0.7)	0.7	0.2
Provision for income taxes	$ 38.6	$ 0.3	$ 40.5

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