Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016
Income Statement [Abstract]
NET SALES	$ 240,628	$ 182,709	$ 414,848	$ 368,774
Cost of sales	220,601	153,012	375,409	311,332
Restructuring costs (Note 4)	(78)	157	130	187
Cost of sales, including restructuring costs	220,523	153,169	375,539	311,519
GROSS PROFIT	20,105	29,540	39,309	57,255
Selling, general and administrative expenses	22,103	10,000	37,363	18,993
INCOME (LOSS) FROM OPERATIONS	(1,998)	19,540	1,946	38,262
Interest (expense) income, net	(14,729)	79	(15,025)	111
Other income (expense), net	7,486	(372)	7,138	(105)
CONSOLIDATED (LOSS) INCOME BEFORE INCOME TAXES	(9,241)	19,247	(5,941)	38,268
Income tax benefit (provision)	1,722	(6,082)	1,524	(10,640)
CONSOLIDATED NET (LOSS) INCOME	(7,519)		(4,417)	27,628
Less: Net loss attributable to non-controlling interest	247	0	247	0
NET (LOSS) INCOME ATTRIBUTABLE TO SUPERIOR	$ (7,272)	$ 13,165	$ (4,170)	$ 27,628
INCOME (LOSS) PER SHARE - BASIC (in dollars per share)	$ (0.41)	$ 0.52	$ (0.28)	$ 1.08
INCOME (LOSS) PER SHARE - DILUTED (in dollars per share)	(0.41)	0.52	(0.28)	1.08
DIVIDENDS DECLARED PER SHARE (in dollars per share)	$ 0.09	$ 0.18	$ 0.27	$ 0.36