Other General Expenses (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 29, 2019	Dec. 30, 2018	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018	Dec. 30, 2018
General and Administrative Expenses
Provision for uncollectible accounts and notes receivable				$ 1,646	$ 4,047
General and administrative expenses	$ 53,503	$ 58,854	$ 55,711	153,356	134,679	$ 193,534
Series B Preferred Stock
General and Administrative Expenses
Starboard option valuation				5,900
General and administrative expenses
General and Administrative Expenses
Starboard option valuation				5,900
Provision for uncollectible accounts and notes receivable	736		388	1,276	2,724
(Gain) loss on disposition of fixed assets	(190)		1,037	1,100	1,497
Other	(116)		774	(833)	1,534
Other general expenses	430		2,199	1,543	5,755
Special Committee costs	7,844		14,949	21,720	14,949
Marketing fund investment amount	5,000			7,500
Severance costs	2,400
Advisory and legal costs			11,300	5,900	11,300
Reimaging costs			3,600		3,600
Administrative expenses	45,229		38,563	130,093	113,975
Management incentive costs and professional fees	6,700			16,200
General and administrative expenses	$ 53,503		$ 55,711	153,356	$ 134,679
General and administrative expenses | Series B Preferred Stock
General and Administrative Expenses
Aggregate purchase price of shares				$ 50,000