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Revenues Impact of Adoption on Consolidated Statement of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 25, 2019	Sep. 25, 2019	Jun. 26, 2019	Mar. 27, 2019	Dec. 26, 2018	Sep. 26, 2018	Jun. 27, 2018	Mar. 28, 2018	Dec. 25, 2019	Dec. 26, 2018	Dec. 27, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income	$ 18,559	$ 49,122	$ 34,239	$ 15,490	$ 11,503	$ 10,805	$ 11,626	$ 9,759	$ 117,410	$ 43,693	$ 39,594
Total comprehensive income					4,816				$ 87,596	41,863	$ 38,685
Adjustments | Adjustments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income					(148)					(1,147)
Total comprehensive income					(148)					(1,147)
Amounts without adoption of Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income					11,355					42,546
Total comprehensive income					$ 4,668					$ 40,716

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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