Operating (Gains), Losses and Other Charges, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2018		Dec. 27, 2017		Dec. 28, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension settlement loss			$ 21		$ 24,297
Software implementation costs	$ 0		5,247		0
(Gains) losses on sales of assets and other, net	(513)		(1,729)		29
Restructuring charges and exit costs	1,575		485		1,486
Impairment charges	1,558		326		1,098
Operating (gains), losses and other charges, net	2,620		4,329		26,910
(Gain) on insurance settlements	(1,200)
(Gain) loss on sale of restaurants	700		300		(600)
Restructuring charges and exit costs [Abstract]
Exit costs	518	[1]	385	[1]	591
Severance and other restructuring charges	1,057		100		895
Total restructuring charges and exit costs	1,575		485		1,486
Components of change in accrued exit cost liabilities [Roll Forward]
Balance, beginning of year	1,180		1,896
Exit costs	518	[1]	385	[1]	591
Payments, net of sublease receipts	(615)		(1,189)
Interest accretion	72		88
Balance, end of year	1,155		1,180		1,896
Less current portion included in other current liabilities	546		345
Long-term portion included in other noncurrent liabilities	609		835
Accrued severance and other restructuring charges	600		100
Estimated net cash payments related to exit cost liabilities [Abstract]
2019	532
2020	177
2021	178
2022	178
2023	166
Thereafter	0
Total	1,231
Less imputed interest	76
Present value of exit cost liabilities	1,155
Existing sublease arrangements	1,200
Impairment charges	1,558		326		1,098
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement loss	$ 0		$ 0		$ 24,297

[1] Included as a component of operating (gains), losses and other charges, net.