Other General Expenses (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Sep. 30, 2018	Dec. 30, 2018
General and Administrative Expenses
Provision for uncollectible accounts and notes receivable					$ 676	$ 3,591
General and administrative expenses	$ 48,718	$ 58,854	$ 55,711	$ 38,972	99,853	78,968	$ 134,680	$ 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					5,600
Provision for uncollectible accounts and notes receivable	516			1,150	540	2,337
Loss on disposition of fixed assets	1,001			299	1,290	460
Other	(304)			(210)	(717)	760
Other general expenses	1,213			1,239	1,113	3,557
Special Committee costs	2,896				13,515
Marketing fund investment amount	2,500				2,500
Advisory and legal costs	400				5,500
Administrative expenses	44,609			37,733	85,225	75,411
Operators' conference expenses incurred	6,900				9,800
General and administrative expenses	$ 48,718			$ 38,972	99,853	$ 78,968
General and administrative expenses | Series B Preferred Stock
General and Administrative Expenses
Aggregate purchase price of shares					$ 50,000