Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jul. 02, 2016
Income Tax Disclosure [Abstract]
Income tax (benefit), reported	$ (5.1)	$ 61.4	$ 46.2
Revaluation of net deferred income tax liability	38.5
Other impact of tax law change	11.9
Stock-based compensation - performance vesting	15.4
Income tax expense, excluding benefits	$ 60.7
Income tax (benefit), reported	(2.60%)	39.00%	40.30%
Revaluation of net deferred income tax liability	19.90%
Other impact of tax law change	6.10%
Stock-based compensation - performance vesting	8.00%
Income tax expense, excluding benefits	31.40%