Stockholders' Equity (Details) - USD ($)		12 Months Ended
	Jan. 14, 2015	Dec. 31, 2017	Dec. 27, 2015	Dec. 25, 2016
Class of Stock [Line Items]
Class A common stock, right to elect percentage of the board of directors		30.00%
Class B Common Stock available for conversion into Class A Common Stock (in shares)		803,763		816,632
Class B common stock, right to elect percentage of the board of directors		70.00%
Warrants exercised by entities controlled by Carlos Slim Helu (in shares)	15,900,000		15,900,000
Exercise price of warrants (in USD per share)	$ 6.3572
Proceeds from warrant exercises	$ 101,100,000
Stock repurchase program, authorized amount	$ 101,100,000.0
Stock repurchased during the period		$ 84,900,000
Amount remaining under share repurchase authorization		$ 16,200,000
Minimum consideration for each share of preferred stock (in usd per share)		$ 100
Preferred stock issued (in shares)		0
Preferred stock outstanding (in shares)		0
Adolph Ochs Family Trust [Member]
Class of Stock [Line Items]
Class B common stock ownership percentage		90.00%