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Business, Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Dec. 23, 2012
Dec. 25, 2011
Dec. 25, 2011
Jun. 30, 2013
Dec. 25, 2011
Contingent Consideration [Member]
Sep. 25, 2011
Contingent Consideration [Member]
Jun. 26, 2011
Contingent Consideration [Member]
Dec. 23, 2012
Derivatives [Member]
Dec. 25, 2011
Derivatives [Member]
Dec. 23, 2012
Derivatives [Member]
Dec. 25, 2011
Derivatives [Member]
Dec. 25, 2011
Investments [Member]
Dec. 25, 2011
Investments [Member]
Dec. 23, 2012
Measured at Fair Value on a Recurring Basis [Member]
Jun. 24, 2012
Measured at Fair Value on a Recurring Basis [Member]
Dec. 23, 2012
Measured at Fair Value on a Recurring Basis [Member]
Level 1 [Member]
Jun. 24, 2012
Measured at Fair Value on a Recurring Basis [Member]
Level 1 [Member]
Dec. 23, 2012
Measured at Fair Value on a Recurring Basis [Member]
Level 2 [Member]
Jun. 24, 2012
Measured at Fair Value on a Recurring Basis [Member]
Level 2 [Member]
Dec. 23, 2012
Measured at Fair Value on a Recurring Basis [Member]
Level 3 [Member]
Jun. 24, 2012
Measured at Fair Value on a Recurring Basis [Member]
Level 3 [Member]
Dec. 23, 2012
Newport and Mexico manufacturing facilities [Member]
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Dec. 23, 2012
Newport and Mexico manufacturing facilities [Member]
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Fiscal year and Quarter [Abstract]                                              
Minimum number of weeks in a fiscal year 52                                            
Maximum number of weeks in a fiscal year 53                                            
Number of weeks in a fiscal quarter 13                                            
Number of weeks in current fiscal year       53                                      
Assets and Liabilities [Abstract]                                              
Cash and cash equivalents                             $ 9,997,000       $ 9,997,000        
Short-term investments                           10,104,000 63,872,000 1,001,000 33,058,000 9,103,000 30,814,000        
Prepaid expenses and other receivables                             622,000       622,000        
Long-term investments                           5,003,000 15,054,000 5,003,000 10,001,000   5,053,000        
Other assets                           26,004,000 27,358,000 22,968,000 24,439,000   85,000 3,036,000 2,834,000    
Other accrued expenses                           (1,451,000)       (1,451,000)          
Other long-term liabilities                           (8,519,000) (8,139,000) (8,358,000) (8,139,000) (161,000)          
Total                           31,141,000 108,764,000 20,614,000 59,359,000 7,491,000 46,571,000 3,036,000 2,834,000    
Fair value as a percentage of total (in hundredths)                           100.00% 100.00% 66.20% 54.60% 24.10% 42.80% 9.70% 2.60%    
Level 3 as a percentage of total assets (in hundredths)                                       0.20% 0.20%    
Carrying value of equipment prior to impairment                                           8,700,000 8,700,000
Equipment Fair Value Disclosure                                           4,000,000 4,000,000
Fixed Asset Impairment Charges                                           4,700,000 4,700,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                                              
Beginning balance   3,148,000 3,554,000         2,920,000 2,846,000 2,834,000 2,773,000 302,000 781,000                    
Total gains or losses (realized or unrealized) [Abstract]                                              
Gains (losses) included in earnings   160,000 287,000         116,000 182,000 202,000 255,000 (22,000) 32,000                    
Gains (losses) included in other comprehensive income     (190,000)                   (190,000)                    
Purchases, maturities, and sales:                                              
Maturities/prepayments   (14,000) (47,000)                 (14,000) (47,000)                    
Sales     (310,000)                   (310,000)                    
Ending balance   3,294,000 3,294,000         3,036,000 3,028,000 3,036,000 3,028,000 266,000 266,000                    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                                              
Beginning balance         400,000 400,000 400,000                                
Ending balance         $ 400,000 $ 400,000 $ 400,000