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Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Sep. 24, 2016
Dec. 26, 2015
Composition of trade receivables    
Client receivables $ 278,041 $ 230,010
Unbilled revenue 84,754 45,996
Total 362,795 276,006
Less: Allowance for doubtful accounts (3,061) (5,938)
Trade receivables, net 359,734 270,068
Composition of inventories    
Raw materials and supplies 18,445 15,998
Work in process 14,119 12,101
Finished products 66,810 65,636
Inventories 99,374 93,735
Composition of other current assets    
Investments 7,734 20,516
Prepaid income taxes 44,467 26,350
Restricted cash 572 271
Other 148 149
Other current assets 52,921 47,286
Composition of other assets    
Life insurance policies 28,837 27,554
Venture capital investments 45,653 32,730
Restricted cash 1,825 1,745
Other 10,014 9,614
Other assets 86,329 71,643
Composition of other current liabilities    
Accrued income taxes 24,138 12,168
Accrued interest and other 993 376
Other current liabilities 25,131 12,544
Composition of other long-term liabilities    
Long-term pension liability 32,639 34,604
Accrued executive supplemental life insurance retirement plan and deferred compensation plan 31,244 30,188
Other 32,888 24,270
Other long-term liabilities $ 96,771 $ 89,062