Stockholders' Equity - Common Stock and Conversion Features (Details)	12 Months Ended
Dec. 27, 2018 item
Conversion of Stock [Line Items]
Number of classes of common stock	3
Class A Common Stock
Conversion of Stock [Line Items]
Votes per share held	1
Class B Common Stock
Conversion of Stock [Line Items]
Votes per share held	0
Class C Common Stock
Conversion of Stock [Line Items]
Votes per share held	0

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.

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration