Consolidated Income Statements - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 25, 2016
Income Statement [Abstract]
NET SALES	$ 1,501,827	$ 1,108,055	$ 732,677
Cost of sales:
Cost of sales	1,338,300	1,005,020	645,015
Restructuring costs		138	1,458
Total cost of sales	1,338,300	1,005,158	646,473
GROSS PROFIT	163,527	102,897	86,204
Selling, general and administrative expenses	77,722	81,379	31,602
INCOME FROM OPERATIONS	85,805	21,518	54,602
Interest (expense) income, net	(50,097)	(40,004)	245
Other (expense) income, net	(6,936)	13,188	(126)
Change in fair value of redeemable preferred stock embedded derivative liability	3,480	6,164
CONSOLIDATED INCOME BEFORE INCOME TAXES	32,252	866	54,721
Income tax provision	(6,291)	(6,875)	(13,340)
CONSOLIDATED NET INCOME (LOSS)	25,961	(6,009)	41,381
Less: Net (income) attributable to non-controlling interest		(194)
NET INCOME (LOSS) ATTRIBUTABLE TO SUPERIOR	$ 25,961	$ (6,203)	$ 41,381
EARNINGS (LOSS) PER SHARE ATTRIBUTABLE TO SUPERIOR - BASIC	$ 0.29	$ (1.01)	$ 1.63
EARNINGS (LOSS) PER SHARE ATTRIBUTABLE TO SUPERIOR - DILUTED	$ 0.29	$ (1.01)	$ 1.62