Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017	Jun. 30, 2018
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	$ 10.9	$ (0.8)	$ 16.6	$ 1.2
Unrecognized tax benefits	53.3		53.3		$ 48.6
Interest and penalties accrued	1.6		1.6
Unrecognized tax benefits that may be recognized during the next twelve months	$ 1.4		$ 1.4
Foreign
Operating Loss Carryforwards [Line Items]
Tax benefit related to income tax intraperiod tax allocation		$ 0.4
State
Operating Loss Carryforwards [Line Items]
Tax benefit related to income tax intraperiod tax allocation				$ 3.2