Investment in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 26, 2015	Dec. 30, 2017	Dec. 31, 2016
Balance sheet data [Abstract]
Current assets		$ 246,127	$ 244,323
Noncurrent assets		139,200	130,400
Current liabilities		174,710	148,806
Noncurrent liabilities		58,334	71,681
Income statement data [Abstract]
Net sales		556,600	579,400
Gross profit		75,600	79,600
Net (loss) income	$ (8,100)	$ (4,153)	$ 3,720