Discontinued Operations (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Aug. 21, 2015	Nov. 30, 2015	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense (benefit)			$ 22.5	$ 1.2	$ (1.1)
Herley
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price, in cash	$ 260.0
Escrow to satisfy any purchase price adjustments	2.0
Working capital adjustments	$ 8.3	$ 8.1
Period to assert claim for indemnification	5 years
Maximum future indemnification payment, amount	$ 34.0
Transaction-related costs	11.5
Gain on sale of operations	80.8
Net payment to company after adjustments		2.7
Net payment from escrow		2.0
Difference in estimated working capital and actual working capital		$ 0.7
Income tax expense (benefit)			22.5	1.2	(1.1)
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			4.2	$ 6.7	$ 7.0
Maximum | Herley
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Taxes incurred as part of transaction	$ 5.0		5.0
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			175.0
Revolving Credit Facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayment of outstanding borrowings			$ 41.0