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Income Taxes (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 14, 2013
Dec. 29, 2012
Dec. 31, 2011
Dec. 25, 2010
Current:        
Federal   $ 0 $ 52,000 $ 0
State   64,000 88,000 66,000
Foreign 1,170,000 0 (137,000) (120,000)
Total current provision   64,000 3,000 (54,000)
Deferred:        
Federal   (2,878,000) 3,977,000 3,464,000
State   (505,000) (30,000) 513,000
Foreign   73,000 (898,000) 2,161,000
Change in valuation allowance   4,345,000 (3,052,000) (6,138,000)
Total deferred provision   1,035,000 (3,000) 0
Total provision (benefit) for income taxes   1,099,000 0 (54,000)
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]        
Tax provision at federal statutory rates   (7,002,000) (2,006,000) 730,000
State tax liability   42,000 57,000 43,000
Foreign deferred   734,000 611,000 2,484,000
Foreign withholding   1,170,000 0 0
Outside basis in KTC and Kowon, net   2,422,000 0 0
Goodwill   417,000 771,000 0
Non-deductible expenses   180,000 415,000 (35,000)
Utilized/expired net state operating loss carryforwards   0 0 (28,000)
Provision to tax return adjustments and state tax rate change   (462,000) 888,000 544,000
Tax credits   (100,000) 1,188,000 (312,000)
Non-deductible equity compensation   136,000 1,542,000 2,630,000
Other, net   (783,000) (414,000) 28,000
Change in valuation allowance   4,345,000 (3,052,000) (6,138,000)
Total provision (benefit) for income taxes   1,099,000 0 (54,000)
Pretax foreign (losses) earnings   (6,870,000) (6,879,000) (121,000)
Deferred tax liability:        
Intangible asset   (636,000) (508,000)  
Foreign withholding liability   (1,170,000) 0  
Foreign unremitted earnings   (3,478,000) 0  
Deferred Tax assets:        
Federal net operating loss carryforwards   9,493,000 3,398,000  
State net operating loss carryforwards   580,000 13,000  
Foreign net operating loss carryforwards   3,028,000 5,533,000  
Equity awards   1,111,000 886,000  
Tax credits   5,267,000 5,599,000  
Equipment   4,131,000 5,068,000  
Investments   4,760,000 3,867,000  
Other   3,582,000 3,903,000  
Net deferred tax assets   26,668,000 27,759,000  
Valuation allowance   (27,973,000) (23,493,000)  
Net deferred tax assets after deducting valuation allowance   (1,305,000) 4,266,000  
Operating Loss Carryforwards, Expiration Dates   expiring through 2032    
Increase (decrease) in valuation allowance   0 4,266,000 0
Utiilzation of operating loss carryforwards   0 2,698,000 2,743,000
Unrecorded benefits from stock award   13,000,000    
Deferred Tax Liabilities, Parent's Basis in Discontinued Operation 3,500,000      
Deferred Tax Asset, Parent's Basis in Discontinued Operation 1,100,000      
Maximum
        
Deferred Tax assets:        
The state impact of any federal changes, subject to examination by various states (in years)   1 year    
KTC
        
Deferred Tax assets:        
Increase (decrease) in valuation allowance     4,900,000  
Increase (decrease) in deferred income taxes     1,700,000  
Utiilzation of operating loss carryforwards     1,100,000  
Segments excluding KTC
        
Deferred Tax assets:        
Increase (decrease) in valuation allowance   4,500,000    
Property, Plant and Equipment, Disposals   2,000,000    
Utiilzation of operating loss carryforwards   6,000,000    
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   $ 27,000,000    
State | Minimum
        
Deferred Tax assets:        
Income tax returns examination period   3 years    
State | Maximum
        
Deferred Tax assets:        
Income tax returns examination period   5 years