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Income Taxes - Deferred Taxes and Operating Loss Carryforwards (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Deferred tax assets:    
Accrued compensation and related expense $ 11,445 $ 16,359
Allowance for doubtful accounts 2,009 2,160
Net operating loss carryforwards 479 3,278
Accrued expenses and other 4,356 2,482
Total gross deferred tax assets 18,289 24,279
Less: valuation allowance (8) (2,689)
Total deferred tax assets net of valuation allowance 18,281 21,590
Deferred tax liabilities:    
Goodwill and other intangible asset amortization 3,802 5,670
GNU capital gain upon distribution 20 245
Property and equipment 6,111 4,495
Tax basis in excess of financial basis of convertible debentures   1,254
Total deferred tax liabilities 9,933 11,664
Net deferred tax assets 8,348 $ 9,926
Net change in valuation allowance (2,700)  
Foreign    
Deferred tax liabilities:    
Net operating loss carryforwards $ 1,400