Employee Pension and Other Benefit Plans - Amounts Recognized on Financial Statements (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jul. 01, 2017
Amount recognized in the Consolidated Balance Sheets at end of year:
Non-current liabilities	$ 103.2	$ 100.0
Other changes in plan assets and benefit obligations recognized in other comprehensive (loss) income:
Net actuarial gain (loss)	(7.3)	(2.8)	$ 0.7
Amortization of accumulated net actuarial losses	1.8	1.5	$ 1.9
Pension Benefit Plans
Amount recognized in the Consolidated Balance Sheets at end of year:
Current liabilities	7.3	7.1
Non-current liabilities	102.8	99.6
Net amount recognized at end of year	110.1	106.7
Amount recognized in accumulated other comprehensive (loss) income at end of year:
Actuarial losses, net of tax	(28.6)	(23.1)
Net amount recognized at end of year	(28.6)	(23.1)
Other changes in plan assets and benefit obligations recognized in other comprehensive (loss) income:
Net actuarial gain (loss)	(7.3)	(2.8)
Amortization of accumulated net actuarial losses	1.8	1.5
Total recognized in other comprehensive (loss) income	$ (5.5)	$ (1.3)