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SUPPLEMENTAL BALANCE SHEET INFORMATION (Details) - USD ($)
$ in Thousands
Jun. 27, 2020
Dec. 28, 2019
Jun. 29, 2019
Composition of trade receivables      
Client receivables $ 403,351 $ 395,740  
Unbilled revenue 133,393 121,957  
Total 536,744 517,697  
Less: Allowance for doubtful accounts (4,213) (3,664)  
Trade receivables, net 532,531 514,033  
Composition of inventories      
Raw materials and supplies 25,426 24,613  
Work in process 36,616 35,852  
Finished products 106,324 100,195  
Inventories 168,366 160,660  
Composition of other current assets      
Prepaid income tax 63,361 54,358  
Short-term investments 929 941  
Restricted cash 465 431 $ 498
Other 307 300  
Other current assets 65,062 56,030  
Composition of other assets      
Venture capital investments 124,730 108,983  
Strategic equity investments 17,087 13,996  
Life insurance policies 36,001 38,207  
Other long-term income tax assets 20,625 20,570  
Restricted cash 1,557 1,601 $ 1,499
Other 24,371 29,258  
Other assets 224,371 212,615  
Composition of other current liabilities      
Current portion of operating lease right-of-use liabilities 24,450 20,357  
Accrued income taxes 32,302 26,066  
Customer contract deposits 41,165 33,080  
Other 10,722 11,095  
Other current liabilities 108,639 90,598  
Composition of other long-term liabilities      
U.S. Transition Tax 50,057 52,066  
Long-term pension liability, accrued executive supplemental life insurance retirement plan and deferred compensation plan 76,572 80,833  
Long-term deferred revenue 15,788 20,983  
Other 33,625 29,051  
Other long-term liabilities $ 176,042 $ 182,933