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Income Taxes - Provision for Income Taxes Differs from Federal Statutory Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 24, 2017	Jun. 25, 2016
Income Tax Disclosure [Abstract]
Provision at U.S. federal statutory rate	$ (22.9)	$ 21.5	$ 26.6
Qualified stock options	4.9	5.5	5.1
Shortfall related to share-based compensation	4.1
Business credits	(4.9)	(3.6)	(10.3)
Foreign tax differential	16.5	(13.2)	(22.4)
Non-deductible portion of contingent consideration		0.9	0.9
Change in valuation allowance		(0.8)	(1.4)
Nondeductible amortization	1.2	1.6	4.4
Taxes associated with one-time transition tax	44.1
Impact of corporate tax rate change on deferred taxes	(2.7)
Other differences	0.2	0.3	0.5
Provision for income taxes	$ 40.5	$ 12.2	$ 3.4

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