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Convertible Senior Notes (Tables)
 3 Months Ended
Mar. 30, 2025
Convertible Notes [Abstract]  
Convertible senior notes balances
The following table includes the outstanding principal amount and carrying value of the Company’s remaining 5.00% convertible senior notes due in 2025 (the “2025 Notes”) as of the periods indicated:
(dollars in thousands)MARCH 30, 2025DECEMBER 29, 2024
Principal$20,724 $20,724 
Less: unamortized debt issuance costs(14)(56)
Net carrying amount$20,710 $20,668 
Convertible senior notes interest expense
Following is a summary of interest expense for the 2025 Notes by component for the periods indicated:
THIRTEEN WEEKS ENDED
(dollars in thousands)MARCH 30, 2025MARCH 31, 2024
Coupon interest$259 $1,006 
Debt issuance cost amortization42 158 
Total interest expense (1)$301 $1,164 
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(1)The effective rate of the 2025 Notes over their expected life is 5.85%.