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Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Dec. 27, 2014
Composition of trade receivables          
Client receivables $ 240,307   $ 240,307   $ 219,118
Unbilled revenue 54,157   54,157   43,780
Total 294,464   294,464   262,898
Less: Allowance for doubtful accounts (5,628)   (5,628)   (4,907)
Trade receivables, net 288,836   288,836   257,991
Composition of inventories          
Raw materials and supplies 15,530   15,530   15,416
Work in process 13,063   13,063   11,802
Finished products 69,504   69,504   61,825
Inventories 98,097   98,097   89,043
Composition of other current assets          
Deferred tax asset 33,156   33,156   27,644
Investments 17,975   17,975   16,167
Prepaid income tax 30,828   30,828   26,287
Restricted cash 1,221   1,221   2,552
Other 923   923   291
Other current assets 84,103   84,103   72,941
Property, Plant and Equipment [Line Items]          
Total 1,342,513   1,342,513   1,331,780
Less: Accumulated depreciation (670,840)   (670,840)   (654,983)
Property, plant and equipment, net 671,673   671,673   676,797
Depreciation expense 17,400 $ 18,400 51,900 $ 51,600  
Composition of other assets          
Life insurance policies 26,458   26,458   27,603
Investments in limited partnerships 29,931   29,931   27,047
Other 9,163   9,163   18,301
Other assets 65,552   65,552   72,951
Composition of other current liabilities          
Accrued income taxes 17,630   17,630   9,362
Current deferred tax liability 3,389   3,389   1,484
Accrued interest and other 328   328   233
Other current liabilities 21,347   21,347   11,079
Composition of other long-term liabilities          
Deferred tax liability 49,016   49,016   30,816
Long-term pension liability 37,878   37,878   45,135
Accrued executive supplemental life insurance retirement plan and deferred compensation plan 33,858   33,858   33,007
Other 19,004   19,004   21,403
Other long-term liabilities 139,756   139,756   130,361
Land          
Property, Plant and Equipment [Line Items]          
Total 42,619   42,619   40,314
Buildings          
Property, Plant and Equipment [Line Items]          
Total 705,694   705,694   682,495
Machinery and equipment          
Property, Plant and Equipment [Line Items]          
Total 381,764   381,764   384,713
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Total 39,221   39,221   37,270
Furniture and fixtures          
Property, Plant and Equipment [Line Items]          
Total 22,053   22,053   22,577
Vehicles          
Property, Plant and Equipment [Line Items]          
Total 4,054   4,054   3,967
Computer hardware and software          
Property, Plant and Equipment [Line Items]          
Total 123,285   123,285   119,474
Construction in progress          
Property, Plant and Equipment [Line Items]          
Total $ 23,823   $ 23,823   $ 40,970