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Discontinued Operations (Details) - USD ($)
1 Months Ended 12 Months Ended
Aug. 21, 2015
Nov. 30, 2015
Dec. 31, 2017
Dec. 25, 2016
Dec. 27, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Income tax expense     $ 100,000 $ 0 $ 22,500,000
Discontinued Operations, Disposed of by Sale | Revolving Credit Facility          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Repayment of outstanding borrowings     41,000,000    
Herley | Discontinued Operations, Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Purchase price, in cash $ 260,000,000        
Escrow to satisfy any purchase price adjustments 2,000,000        
Working capital adjustments $ 8,300,000 $ 8,100,000      
Period to assert claim for indemnification 5 years        
Maximum future indemnification payment, amount $ 34,000,000        
Transaction-related costs 11,500,000        
Gain on sale of operations 80,800,000        
Net payment to company after adjustments   2,700,000      
Net payment from escrow   2,000,000      
Difference in estimated working capital and actual working capital   $ 700,000      
Income tax expense     100,000 0 22,500,000
Herley | Discontinued Operations, Disposed of by Sale | Maximum          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Taxes incurred as part of transaction $ 5,000,000     $ 5,000,000  
Herley | Discontinued Operations, Disposed of by Sale | Senior notes | 7% Senior Notes due 2019 | Minimum          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Redemption of notes     $ 175,000,000    
Herley | Discontinued Operations, Disposed of by Sale | Selling, general and administrative expenses          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Depreciation and amortization expense         $ 4,200,000