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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent									$ 47,033	$ 87,087	$ 24,878
Income (Loss) from Continuing Operations, Per Diluted Share									$ 1.44	$ 2.72	$ 0.80
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share									$ 3.71	$ (0.64)	$ (0.61)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									$ 120,931	$ (20,408)	$ (18,917)
Net income (loss)	$ 19,196	$ (8,303)	$ 23,056	$ 13,084	$ 54,698	$ 19,882	$ 9,559	$ 2,948	$ 167,964	$ 66,679	$ 5,961
Denominator for basic EPS:
Weighted average shares outstanding									32,136	31,402	30,778
Effect of dilutive securities stock options, restricted stock and restricted stock units									460	654	195
Denominator for diluted EPS									32,596	32,056	30,973
Income (Loss) from Continuing Operations, Per Basic Share									$ 1.46	$ 2.77	$ 0.81
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share									3.76	(0.65)	(0.61)
Basic (in dollars per share)	$ 0.59	$ (0.26)	$ 0.72	$ 0.41	$ 1.73	$ 0.63	$ 0.31	$ 0.10	5.23	2.12	0.19
Diluted (in dollars per share)	$ 0.58	$ (0.26)	$ 0.70	$ 0.40	$ 1.69	$ 0.62	$ 0.30	$ 0.09	$ 5.15	$ 2.08	$ 0.19

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- References

No definition available.

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