Long-term Debt and Letters of Credit - Schedule of Remaining Unamortized Debt Discount and Debt Issuance Costs (Detail) - USD ($) $ in Thousands	Sep. 28, 2020	Dec. 30, 2019
Debt Instrument [Line Items]
Debt Issuance Costs	$ 7,802	$ 12,974
Debt Discount	3,054	11,943
1.75% Convertible Senior Notes due December 15, 2020
Debt Instrument [Line Items]
Debt Issuance Costs	219	995
Debt Discount	$ 2,188	$ 9,927
Effective Interest Rate	6.48%	6.48%
Term Loan Due September 2024
Debt Instrument [Line Items]
Debt Issuance Costs	$ 2,862	$ 6,663
Debt Discount	$ 866	$ 2,016
Effective Interest Rate	4.66%	4.66%
Senior Notes Due October 2025
Debt Instrument [Line Items]
Debt Issuance Costs	$ 4,721	$ 5,316
Effective Interest Rate	5.92%	5.92%

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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