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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Income Taxes [Line Items] |  |  |
Federal tax rate | 21.00% | 21.00% | 21.00%
Effective tax rate | 27.30% | 23.30% | 23.60%
Unrecognized tax benefits that would impact effective tax rate | $ 1.7 | $ 1.8 | $ 1.7
Earliest Tax Year [Member] | PENNSYLVANIA |  |  |
Income Taxes [Line Items] |  |  |
Open Tax Year | 2016 |  |
Latest Tax Year [Member] | PENNSYLVANIA |  |  |
Income Taxes [Line Items] |  |  |
Open Tax Year | 2020 |  |
Federal [Member] |  |  |
Income Taxes [Line Items] |  |  |
Income Taxes Paid | $ 33.5 | 11.3 | 4.5
State [Member] |  |  |
Income Taxes [Line Items] |  |  |
Income Taxes Paid | 8.8 | $ 2.8 | $ 2.1
Operating Loss Carryforwards | $ 72.0 |  |

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