Annual report pursuant to Section 13 and 15(d)

Property And Equipment (Details)

v3.8.0.1
Property And Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 177,355 $ 163,677  
Less accumulated depreciation and amortization 86,202 75,792  
Property and equipment, net 91,153 87,885  
Property and equipment, net 102,847 101,267  
Depreciation $ 14,480 11,878 $ 9,034
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 39 years 6 months    
Property and equipment, gross $ 73,344 70,719  
Laboratory And Production Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 31,063 29,697  
Sound And Video Library [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Property and equipment, gross   600  
Computer Equipment And Software [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 50,124 41,801  
Furniture And Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 6,453 6,164  
Automobiles [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 562 369  
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 12,740 11,701  
Land Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 15 years    
Property and equipment, gross $ 3,069 2,626  
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, net 7,521 6,286  
Deposits And Projects In Process [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, net $ 4,173 $ 7,096  
Minimum [Member] | Laboratory And Production Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Minimum [Member] | Computer Equipment And Software [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Minimum [Member] | Furniture And Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Minimum [Member] | Automobiles [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Minimum [Member] | Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Maximum [Member] | Laboratory And Production Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 7 years    
Maximum [Member] | Computer Equipment And Software [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Maximum [Member] | Furniture And Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Maximum [Member] | Automobiles [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Maximum [Member] | Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 5 years