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Fair Value Measurement, Financial Instruments And Risk Management (Narrative) (Details)
€ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 27, 2015
USD ($)
Dec. 28, 2014
USD ($)
Dec. 29, 2013
USD ($)
Dec. 27, 2015
USD ($)
Dec. 28, 2014
USD ($)
Dec. 29, 2013
USD ($)
Dec. 27, 2015
EUR (€)
Fair Value Disclosures [Line Items]              
Trade names $ 14,718,000 $ 20,512,000   $ 14,718,000 $ 20,512,000    
Intangible asset impairment 5,800,000 900,000          
Restructuring-related asset impairment       0 172,000 $ 1,211,000  
Long-lived assets 77,386,000 77,389,000   77,386,000 77,389,000    
Derivative Asset 109,000 55,000   109,000 55,000    
Liabilities 135,000 23,000   135,000 23,000    
Unrealized gain recorded in other comprehensive income, net of tax       (125,000) 0 (21,000)  
Aggregate foreign currency transaction losses       23,000 1,000,000 4,100,000  
Foreign currency forward exchange contracts              
Fair Value Disclosures [Line Items]              
Notional amount of derivatives not designated as hedging instruments 6,500,000     6,500,000     € 15.0
Derivative Asset 109,000 55,000   109,000 55,000    
Liabilities   23,000     23,000    
Cash flow hedge liabilities at fair value 100,000     100,000      
Other comprehensive income, unrealized loss, before Tax       100,000      
Unrealized gain recorded in other comprehensive income, net of tax       0      
Hedge ineffectiveness       0      
Foreign currency revenue forecast contracts              
Fair Value Disclosures [Line Items]              
Notional amount of derivatives not designated as hedging instruments 16,400,000     16,400,000      
Liabilities 135,000     135,000      
Price risk cash flow hedge unrealized gain (loss) 100,000     100,000      
Global Restructuring Plan              
Fair Value Disclosures [Line Items]              
Restructuring-related asset impairment         200,000    
Long-lived assets   200,000     200,000    
Property, plant, and equipment, fair value disclosure   21,000     21,000    
Alpha Business              
Fair Value Disclosures [Line Items]              
Trade names $ 13,600,000     $ 13,600,000      
OAT              
Fair Value Disclosures [Line Items]              
Trade names   $ 1,100,000     $ 1,100,000    
Enterprise Resource Planning System              
Fair Value Disclosures [Line Items]              
Carrying amount, asset     $ 4,700,000     $ 4,700,000  
Internal-use software impairment     $ 4,700,000