Deferred Tax Assets, Tax Credit Carryforwards, General Business, Estimated Future Amount

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Deferred Tax Assets, Tax Credit Carryforwards, General Business, Period of Use

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible general business tax credit carryforwards.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Income Taxes (Tax Carryforwards - Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Income Tax Contingency [Line Items]
Federal tax credit carryforwards		$ 115,273	$ 99,591
Foreign loss carryforwards		41,406
Foreign tax credit carryforwards		809
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Federal tax credit carryforwards		131,201
General business tax credit carryforwards		$ 128,600
Internal Revenue Service (IRS) [Member] \| Minimum [Member]
Income Tax Contingency [Line Items]
General business tax credits, estimated period of use		4 years
Internal Revenue Service (IRS) [Member] \| Minimum [Member] \| Scenario, forecast [Member]
Income Tax Contingency [Line Items]
General business tax credits, estimated future tax credits	$ 40,000
Internal Revenue Service (IRS) [Member] \| Maximum [Member]
Income Tax Contingency [Line Items]
General business tax credits, estimated period of use		6 years
Internal Revenue Service (IRS) [Member] \| Maximum [Member] \| Scenario, forecast [Member]
Income Tax Contingency [Line Items]
General business tax credits, estimated future tax credits	$ 45,000