Debts and Letters of Credit - Interest Expense (Details) - 0.625% Senior Convertible Notes - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Apr. 01, 2017	Apr. 02, 2016
Interest expense for the contractual interest and the amortization of debt discount
Effective interest rate (as a percent)	5.30%	5.40%	5.30%	5.40%
Interest expense-contractual interest	$ 1.3	$ 1.0	$ 3.4	$ 3.0
Accretion of debt discount	$ 7.9	$ 6.7	$ 21.9	$ 19.9