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Income Taxes (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 14, 2013
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Current:        
Federal   $ (13,124,000) $ 0 $ 52,000
State   12,000 64,000 88,000
Foreign 1,500,000 (34,000) 0 (137,000)
Total current provision   (13,146,000) 64,000 3,000
Deferred:        
Federal   (3,616,000) (2,878,000) 3,977,000
State   644,000 (505,000) (30,000)
Foreign   (565,000) 73,000 (898,000)
Change in valuation allowance   3,750,000 4,345,000 (3,052,000)
Total deferred provision   213,000 1,035,000 (3,000)
Total (benefit) provision for income taxes   (12,933,000) 1,099,000 0
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]        
Tax provision at federal statutory rates   (13,322,000) (7,002,000) (2,006,000)
State tax liability   8,000 42,000 57,000
Foreign deferred   (644,000) 734,000 611,000
Foreign withholding   308,000 1,170,000 0
Outside basis in KTC and Kowon, net   (202,000) 2,422,000 0
Goodwill   0 417,000 771,000
Non-deductible expenses   864,000 180,000 415,000
Increase in net state operating loss carryforwards   (2,868,000) 0 0
Provision to tax return adjustments and state tax rate change   (33,000) (462,000) 888,000
Tax credits   (390,000) (100,000) 1,188,000
Non-deductible equity compensation   (418,000) 136,000 1,542,000
Other, net   14,000 (783,000) (414,000)
Change in valuation allowance   3,750,000 4,345,000 (3,052,000)
Total (benefit) provision for income taxes   (12,933,000) 1,099,000 0
Pretax foreign (losses) earnings   (4,966,000) (6,870,000) (6,879,000)
Deferred tax liability:        
Intangible asset   (141,000) (636,000)  
Foreign withholding liability   (1,478,000) (1,170,000)  
Foreign unremitted earnings   (3,276,000) (3,478,000)  
Deferred Tax assets:        
Federal net operating loss carryforwards   15,322,000 9,493,000  
State net operating loss carryforwards   624,000 580,000  
Foreign net operating loss carryforwards   3,202,000 3,028,000  
Equity awards   1,666,000 1,111,000  
Tax credits   5,657,000 5,267,000  
Equipment   838,000 4,131,000  
Investments   4,594,000 4,760,000  
Other   3,365,000 3,582,000  
Net deferred tax assets   30,373,000 26,668,000  
Valuation allowance   (31,886,000) (27,973,000)  
Net deferred tax assets after deducting valuation allowance   (1,513,000) (1,305,000)  
Operating Loss Carryforwards, Expiration Dates   expiring through 2032    
Increase (decrease) in valuation allowance   0 0 4,266,000
Utiilzation of operating loss carryforwards   0 0 2,698,000
Unrecorded benefits from stock award   10,100,000    
Deferred Tax Liabilities, Parent's Basis in Discontinued Operation   3,300,000    
Income Tax Expense (Benefit)   12,933,209 (1,099,000) 0
Maximum
        
Deferred Tax assets:        
The state impact of any federal changes, subject to examination by various states (in years)   1 year    
Segments excluding KTC
        
Deferred Tax assets:        
Increase (decrease) in valuation allowance   3,700,000    
Utiilzation of operating loss carryforwards   8,600,000 6,000,000  
Property, Plant and Equipment, Disposals   2,000,000    
International jurisdictions | Minimum
        
Deferred Tax assets:        
Income tax returns examination period   3 years    
International jurisdictions | Maximum
        
Deferred Tax assets:        
Income tax returns examination period   7 years    
Federal
        
Deferred Tax assets:        
Net operating loss carryforwards available for tax purposes   $ 43,700,000    
State | Minimum
        
Deferred Tax assets:        
Income tax returns examination period   3 years    
State | Maximum
        
Deferred Tax assets:        
Income tax returns examination period   5 years