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Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Dec. 27, 2014
Composition of trade receivables          
Client receivables $ 233,569   $ 233,569   $ 219,118
Unbilled revenue 49,016   49,016   43,780
Total 282,585   282,585   262,898
Less: Allowance for doubtful accounts (5,187)   (5,187)   (4,907)
Trade receivables, net 277,398   277,398   257,991
Composition of inventories          
Raw materials and supplies 13,885   13,885   15,416
Work in process 12,023   12,023   11,802
Finished products 64,129   64,129   61,825
Inventories 90,037   90,037   89,043
Composition of other current assets          
Deferred tax asset 23,058   23,058   27,644
Investments 18,074   18,074   16,167
Prepaid income tax 31,537   31,537   26,287
Restricted cash 100   100   2,552
Other 1,684   1,684   291
Other current assets 74,453   74,453   72,941
Property, Plant and Equipment [Line Items]          
Total 1,341,797   1,341,797   1,331,780
Less: Accumulated depreciation (661,232)   (661,232)   (654,983)
Property, plant and equipment, net 680,565   680,565   676,797
Depreciation expense 17,400 $ 17,400 34,500 $ 33,200  
Composition of other assets          
Life insurance policies 28,237   28,237   27,603
Investments in limited partnerships 29,141   29,141   27,047
Other 5,838   5,838   18,301
Other assets 63,216   63,216   72,951
Composition of other current liabilities          
Accrued income taxes 10,906   10,906   9,362
Current deferred tax liability 1,302   1,302   1,484
Accrued interest and other 356   356   233
Other current liabilities 12,564   12,564   11,079
Composition of other long-term liabilities          
Deferred tax liability 25,550   25,550   30,816
Long-term pension liability 40,531   40,531   45,135
Accrued executive supplemental life insurance retirement plan and deferred compensation plan 33,424   33,424   33,007
Other long-term liabilities 11,751   11,751   21,403
Other long-term liabilities 111,256   111,256   130,361
Land          
Property, Plant and Equipment [Line Items]          
Total 42,796   42,796   40,314
Buildings          
Property, Plant and Equipment [Line Items]          
Total 711,943   711,943   682,495
Machinery and equipment          
Property, Plant and Equipment [Line Items]          
Total 380,871   380,871   384,713
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Total 36,955   36,955   37,270
Furniture and fixtures          
Property, Plant and Equipment [Line Items]          
Total 21,237   21,237   22,577
Vehicles          
Property, Plant and Equipment [Line Items]          
Total 4,101   4,101   3,967
Computer hardware and software          
Property, Plant and Equipment [Line Items]          
Total 122,050   122,050   119,474
Construction in progress          
Property, Plant and Equipment [Line Items]          
Total $ 21,844   $ 21,844   $ 40,970