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Debt - Additional Information (Details) - USD ($)			1 Months Ended	3 Months Ended	6 Months Ended
	Mar. 03, 2017	Aug. 21, 2013	Mar. 31, 2017	Dec. 30, 2017	Dec. 30, 2017	Dec. 31, 2016	Jul. 01, 2017	Mar. 22, 2017
Debt details
Loss on extinguishment of debt					$ 3,800,000	$ 0
1.00% Senior Convertible Notes | Convertible Notes
Debt details
Interest rate on senior convertible notes				1.00%	1.00%
Aggregate principal amount of convertible debt	$ 400,000,000							$ 60,000,000
Proceeds from debt, net of issuance costs			$ 451,100,000
Discount rate	4.80%
Derivative, term of contract	7 years
Amount outstanding				$ 460,000,000	$ 460,000,000		$ 460,000,000
Fair market value of convertible debt				$ 453,400,000	$ 453,400,000		481,700,000
0.625% Senior Convertible Notes | Convertible Notes
Debt details
Interest rate on senior convertible notes		0.625%		0.625%	0.625%
Aggregate principal amount of convertible debt		$ 650,000,000.0
Proceeds from debt, net of issuance costs		$ 636,300,000
Discount rate		5.40%
Derivative, term of contract		5 years
Redemption percentage		100.00%
Expected remaining term					7 months 18 days
Principal amount of debt repurchased				$ 12,500,000	$ 159,000,000
Cash paid for repurchase of debt				13,000,000	175,000,000
Loss on extinguishment of debt				200,000	3,800,000
Amount outstanding				451,000,000	451,000,000		610,000,000
Fair market value of convertible debt				$ 465,700,000	$ 465,700,000		$ 676,100,000

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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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