Operating (Gains), Losses and Other Charges, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2018	Jun. 28, 2017	Jun. 27, 2018		Jun. 28, 2017	Dec. 27, 2017
Other Income and Expenses [Abstract]
Software implementation costs	$ 0	$ 1,544	$ 0		$ 3,668
(Gains) losses on sales of assets and other, net	(27)	205	(64)		(1,235)
Restructuring charges and exit costs	408	297	768		396
Impairment charges	81	0	118		0
Operating (gains), losses and other charges, net	462	2,046	822		2,829
Restructuring Charges [Abstract]
Exit costs	275	295	299	[1]	326
Severance and other restructuring charges	133	2	469		70
Total restructuring charges and exit costs	408	297	768		396
Restructuring Reserve [Roll Forward]
Balance, December 27, 2017			1,180
Exit costs	275	$ 295	299	[1]	$ 326
Payments, net of sublease receipts			(316)
Interest accretion			40
Balance, June 27, 2018	1,203		1,203
Less current portion included in other current liabilities	519		519
Long-term portion included in other noncurrent liabilities	684		684
Accrued severance and other restructuring charges	$ 200		$ 200			$ 100

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