Summary of Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 30, 2017

Summary of Quarterly Financial Data (unaudited) [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

The following is a condensed summary of our quarterly results (in thousands, except net income (loss) per share amounts). Quarterly diluted net income (loss) per share amounts may not total to the respective annual amount due to changes in weighted-average shares outstanding during the year. 

2017	First		Second			Third		Fourth		Fiscal Year
Net sales	$	393,899	$	284,673		$	402,646	$	363,279	$	1,444,497
Gross profit	246,459		176,619			253,465		220,804		897,347
Operating income (loss)	35,828		(3,061		)	39,029		20,119		91,915
Net income (loss)	24,461		(778		)	25,603		15,791		65,077
Net income (loss) per share – diluted	$	0.56	$	(0.02	)	$	0.62	$	0.39	$	1.55

2016	First		Second		Third		Fourth		Fiscal Year
Net sales	$	352,980	$	276,878	$	367,988	$	313,445	$	1,311,291
Gross profit	209,074		171,261		232,343		197,482		810,160
Operating income	19,898		2,396		39,044		15,312		76,650
Net income	12,969		1,416		25,745		11,287		51,417
Net income per share – diluted	$	0.27	$	0.03	$	0.56	$	0.25	$	1.10