Debt Obligations - Debt & Capital Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 30, 2018
Debt Instrument [Line Items]
Capital Lease Obligations, Current	$ 6,839	$ 6,832
Total short-term debt and finance lease obligations	$ 254,530	253,630
Option To Repurchase Headquarters Building 2019
Debt Instrument [Line Items]
Imputed interest rate, as a percentage	13.00%
Principal amount	$ 250,000	250,000
Less unamortized discount based on imputed interest rate of 13.0%	2,309	3,202
Net option to repurchase ownership interest in headquarters building in 2019	$ 247,691	$ 246,798

Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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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Contractual interest rate for funds borrowed, under the debt agreement.

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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 and capital lease obligations including current maturities.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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