Debt Agreements - Schedule of Maturities of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 24, 2021	Dec. 25, 2020
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (10,325)
Less: Current maturities of long-term debt	2,924	$ 21,149
Long-term debt	438,676	630,864
Secured Debt
Debt Instrument [Line Items]
Remainder of 2021	1,462
2022	2,924
2023	2,924
2024	444,307
Total future maturities of long-term debt	451,617
Unamortized debt issuance costs	(10,017)	$ (20,595)
Total indebtedness	441,600
Less: Current maturities of long-term debt	2,924
Long-term debt	$ 438,676

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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