Debts and Letters of Credit (Details)		3 Months Ended		6 Months Ended
	Aug. 17, 2015 $ / shares	Dec. 31, 2016 USD ($) letter_of_credit	Jan. 02, 2016 USD ($)	Dec. 31, 2016 USD ($) letter_of_credit $ / shares	Jan. 02, 2016 USD ($)	Jul. 02, 2016 USD ($)	Aug. 21, 2013 USD ($)
Carrying amounts of the liability and equity components:
Short-term debt		$ 0		$ 0		$ 0
Outstanding Letters of Credit
Number of standby letters of credit | letter_of_credit		12		12
Letters of credit outstanding		$ 15,200,000		$ 15,200,000
0.625% Senior Convertible Notes
Carrying amounts of the liability and equity components:
Principal amount of notes		650,000,000		650,000,000		650,000,000
Unamortized discount of liability component		(47,800,000)		(47,800,000)		(61,700,000)
Unamortized debt issuance costs		(3,900,000)		(3,900,000)		(5,000,000)
Carrying value of the liability component		598,300,000		598,300,000		583,300,000
Carrying amount of equity component		$ 134,400,000		$ 134,400,000		134,400,000
Aggregate principal amount of convertible debt							$ 650,000,000.0
Interest rate on senior convertible notes (as a percent)		0.625%		0.625%			0.625%
Proceeds from issuance of convertible notes after issuance costs							$ 636,300,000
Conversion price of debt (in dollars per share) | $ / shares	$ 11.28			$ 11.28
Fair market value of convertible debt		$ 672,000,000		$ 672,000,000		$ 633,000,000
Interest expense for the contractual interest and the amortization of debt discount
Effective interest rate (as a percent)		5.40%	5.40%	5.40%	5.40%
Interest expense-contractual interest		$ 1,000,000	$ 1,000,000	$ 2,000,000	$ 2,000,000
Accretion of debt discount		$ 7,000,000	$ 6,600,000	$ 13,900,000	$ 13,200,000