Discontinued Operations (Details) - USD ($)		1 Months Ended	12 Months Ended
	Aug. 21, 2015	Nov. 30, 2015	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense			$ 0	$ 22,500,000	$ 1,200,000
Herley
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			0	22,500,000	1,200,000
Herley | Selling, general and administrative expenses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization expense			0	4,200,000	$ 6,700,000
Maximum | Herley
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
Senior notes | 7% Senior Notes due 2019 | Minimum | Herley
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Redemption of notes			175,000,000
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