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Convertible Senior Notes (Tables)
 9 Months Ended
Sep. 24, 2023
Convertible Notes [Abstract]  
Convertible senior notes balances
The following table includes the outstanding principal amount and carrying value of the 2025 Notes as of the periods indicated:
(dollars in thousands)SEPTEMBER 24, 2023DECEMBER 25, 2022
Principal$104,786 $105,000 
Less: debt issuance costs(1,342)(1,939)
Net carrying amount$103,444 $103,061 
Convertible senior notes interest expense
Following is a summary of interest expense for the 2025 Notes by component for the periods indicated:
THIRTEEN WEEKS ENDEDTHIRTY-NINE WEEKS ENDED
(dollars in thousands)SEPTEMBER 24, 2023SEPTEMBER 25, 2022SEPTEMBER 24, 2023SEPTEMBER 25, 2022
Coupon interest$1,310 $1,313 $3,932 $6,785 
Debt issuance cost amortization201 190 594 963 
Total interest expense (1)$1,511 $1,503 $4,526 $7,748 
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(1)The effective rate of the 2025 Notes over their expected life is 5.85%. The decrease in interest expense during the thirty-nine weeks ended September 24, 2023 relates to the 2025 Notes Partial Repurchase in May 2022.