Summary of Quarterly Results (Tables)

12 Months Ended

Dec. 27, 2014

Summary of Quarterly Results [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

(dollars in thousands, except per share amounts)	Thirteen Weeks Ended
	March 29, 2014		June 28, 2014		September 27, 2014		December 27, 2014
Net sales	$	687,127	$	691,875	$	683,893	$	713,788
Gross profit on sales		186,768		187,724		185,677		192,793
Net income		14,766		12,798		13,707		13,896
Basic and diluted earnings per share		.55		.48		.51		.51

(dollars in thousands, except per share amounts)	Thirteen Weeks Ended
	March 30, 2013		June 29, 2013		September 28, 2013		December 28, 2013
Net sales	$	682,712	$	662,072	$	661,412	$	686,392
Gross profit on sales		191,127		190,322		182,763		181,256
Net income		20,129		24,179		11,692		15,721
Basic and diluted earnings per share		.75		.90		.43		.59