When testing, based upon the trading price of the debt, whether convertible debt may be converted by the debt holder, represents the percentage of the closing stock price which is multiplied by the number of shares underlying the debt in order to calculate the target that the debt price must stay below.

No definition available.

Debt - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Jun. 01, 2020 USD ($) D $ / shares	Mar. 06, 2017 USD ($) D $ / shares	Jan. 02, 2021 USD ($)	Jan. 06, 2021 USD ($)
Debt
Loss on debt extinguishment			$ (4,060)
Credit Facility
Debt
Repayment of credit facility amount	$ 310,000
0.625% Convertible Senior Notes (2025 Notes)
Debt
Principal amount	$ 535,000
Semi-annual interest rate	0.625%		0.625%
Conversion rate, shares per $1,000 principal	8.1498
Conversion, number of shares of common stock	4,400
Initial conversion price \| $ / shares	$ 122.70
Debt issuance costs	$ 10,400
0.625% Convertible Senior Notes (2025 Notes) \| Conversion of Notes, Holders
Debt
Number of trading days within 30 trading day period \| D	20
Number of consecutive trading days \| D	30
Stock price trigger per share \| $ / shares	$ 159.51
Stock price trigger, as a percentage of conversion price	130.00%
Number of consecutive business days after the 10 consecutive trading day period \| D	5
Number of consecutive trading days before the five consecutive business days \| D	10
Maximum threshold stock price, as a percentage of conversion price	98.00%
0.625% Convertible Senior Notes (2025 Notes) \| Conversion of Notes, Company
Debt
Stock price trigger, as a percentage of conversion price	130.00%
Number of consecutive business days after the 10 consecutive trading day period \| D	20
Number of consecutive trading days before the five consecutive business days \| D	30
1.375% Convertible Senior Notes (2022 Notes)
Debt
Principal amount		$ 400,000
Semi-annual interest rate		1.375%	1.375%
Repayment of credit facility amount			$ 305,100
Aggregate principal amount of debt repurchased	$ 236,800		259,400
Conversion rate, shares per $1,000 principal		10.7744
Conversion, number of shares of common stock		4,300
Initial conversion price \| $ / shares		$ 92.81
Debt issuance costs		$ 10,600
Remaining principal amount				$ 140,600
1.375% Convertible Senior Notes (2022 Notes) \| Interest expense
Debt
Loss on debt extinguishment			$ (4,100)
1.375% Convertible Senior Notes (2022 Notes) \| Conversion of Notes, Holders
Debt
Number of trading days within 30 trading day period \| D		20
Number of consecutive trading days \| D		30
Stock price trigger per share \| $ / shares		$ 120.66
Stock price trigger, as a percentage of conversion price		130.00%
Maximum threshold stock price, as a percentage of conversion price		98.00%
1.375% Convertible Senior Notes (2022 Notes) \| Conversion of Notes, Company
Debt
Stock price trigger, as a percentage of conversion price		130.00%
Number of consecutive business days after the 10 consecutive trading day period \| D		20
Number of consecutive trading days before the five consecutive business days \| D		30