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Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Apr. 01, 2017
Composition of trade receivables      
Client receivables $ 343,546 $ 335,839  
Contract assets (unbilled revenue) 98,801 96,297  
Total 442,347 432,136  
Less: Allowance for doubtful accounts (2,238) (2,120)  
Trade receivables, net 440,109 430,016  
Composition of inventories      
Raw materials and supplies 20,353 19,858  
Work in process 19,080 18,200  
Finished products 79,613 76,898  
Inventories 119,046 114,956  
Composition of other current assets      
Investments 2,542 28,489  
Prepaid income taxes 49,932 52,234  
Restricted cash 605 592 $ 538
Other current assets 53,079 81,315  
Composition of other assets      
Life insurance policies 33,943 34,008  
Venture capital investments 76,076 71,101  
Restricted cash 2,021 1,945 $ 1,765
Other 24,592 16,948  
Other assets 136,632 124,002  
Composition of other current liabilities      
Accrued income taxes 34,532 43,250  
Contract liabilities (customer contract deposits) 23,566 0  
Other 4,474 1,210  
Other current liabilities 62,572 44,460  
Composition of other long-term liabilities      
U.S. Transition Tax 66,851 61,038  
Long-term pension liability 51,607 52,364  
Accrued executive supplemental life insurance retirement plan and deferred compensation plan 37,935 37,582  
Other 48,478 43,831  
Other long-term liabilities $ 204,871 $ 194,815