Revenue from Contracts with Customers - Revenues Disaggregated by Geographic Market (Details) - Revenue - Geographic Concentration Risk	12 Months Ended
Dec. 25, 2019	Dec. 26, 2018	Dec. 27, 2017
Disaggregation of Revenue [Line Items]
Percentage of concentration	100.00%	100.00%
Greater Los Angeles area market
Disaggregation of Revenue [Line Items]
Percentage of concentration	70.50%	69.20%	72.90%
Other markets
Disaggregation of Revenue [Line Items]
Percentage of concentration	29.50%	30.80%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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