Debt - Convertible Senior Notes (Details) $ / shares in Units, shares in Millions	Mar. 06, 2017 USD ($) item $ / shares shares	Mar. 31, 2018 USD ($)	Dec. 30, 2017 USD ($)
Amended Credit Agreement
Debt
Repayment of debt	$ 72,500,000
1.375% Convertible Senior Notes
Debt
Principal amount of convertible senior notes sold in private placement	$ 400,000,000	$ 400,000,000	$ 400,000,000
Stated interest rate	1.375%
Conversion rate	10.7744
Principal amount of notes	$ 1,000
Number of shares of common stock | shares	4.3
Initial conversion price | $ / shares	$ 92.81
Number of trading days within 30 trading day period | item	20
Number of consecutive trading days | item	30
Minimum amount the sales price of the Company's stock exceeds the conversion price (as a percent)	130.00%
Number of consecutive business days after the 10 consecutive trading day period	5 days
Number of consecutive trading days before the five consecutive business days	10 days
Maximum amount the sales price of the Company's stock exceeds the conversion price (as a percent)	98.00%