Income Taxes - Provision for Income Taxes Differs from Federal Statutory Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 24, 2017	Jun. 25, 2016	Jun. 27, 2015
Income Tax Disclosure [Abstract]
Provision at U.S. federal statutory rate	$ 21.5	$ 26.6	$ 56.1
Qualified stock options	5.5	5.1	2.7
Business credits	(3.6)	(10.3)	(4.7)
Foreign tax differential	(13.2)	(22.4)	(4.3)
Non-deductible portion of contingent consideration	0.9	0.9	(4.7)
Change in valuation allowance	(0.8)	(1.4)	(0.5)
Nondeductible amortization	1.6	4.4	2.7
Other differences	0.3	0.5	2.5
Provision for income taxes	$ 12.2	$ 3.4	$ 49.8