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RESTRUCTURING AND ASSET IMPAIRMENTS - Severance and Retention Costs For RMS Facility by Classification on the Consolidated Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Restructuring Cost and Reserve [Line Items]      
Expense $ 4,778 $ 17,879 $ 8,006
Cost of revenue (excluding amortization of intangible assets)      
Restructuring Cost and Reserve [Line Items]      
Expense 2,873 14,142 2,568
Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Expense 1,905 3,737 5,438
Severance and Transition Costs      
Restructuring Cost and Reserve [Line Items]      
Expense 3,849 8,454 6,173
Severance and Transition Costs | Cost of revenue (excluding amortization of intangible assets)      
Restructuring Cost and Reserve [Line Items]      
Expense 1,944 4,717 735
Severance and Transition Costs | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Expense 1,905 3,737 5,438
Asset Impairments and Accelerated Depreciation      
Restructuring Cost and Reserve [Line Items]      
Expense 929 4,809 1,833
Asset Impairments and Accelerated Depreciation | Cost of revenue (excluding amortization of intangible assets)      
Restructuring Cost and Reserve [Line Items]      
Expense 929 4,809 1,833
Asset Impairments and Accelerated Depreciation | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Expense 0 $ 0 $ 0
RMS      
Restructuring Cost and Reserve [Line Items]      
Expense 18,145    
RMS | Cost of revenue (excluding amortization of intangible assets)      
Restructuring Cost and Reserve [Line Items]      
Expense 18,078    
RMS | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Expense 67    
RMS | Severance and Transition Costs      
Restructuring Cost and Reserve [Line Items]      
Expense 429    
RMS | Severance and Transition Costs | Cost of revenue (excluding amortization of intangible assets)      
Restructuring Cost and Reserve [Line Items]      
Expense 362    
RMS | Severance and Transition Costs | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Expense 67    
RMS | Asset Impairments and Accelerated Depreciation      
Restructuring Cost and Reserve [Line Items]      
Expense 17,716    
RMS | Asset Impairments and Accelerated Depreciation | Cost of revenue (excluding amortization of intangible assets)      
Restructuring Cost and Reserve [Line Items]      
Expense 17,716    
RMS | Asset Impairments and Accelerated Depreciation | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Expense $ 0