Discontinued Operations - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jun. 10, 2018	Jul. 01, 2018	Jun. 25, 2017	Jul. 01, 2018	Jun. 25, 2017	Nov. 30, 2017
6.5% Notes | Senior notes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stated interest rate						6.50%
Public Safety & Security | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price, in cash	$ 69.0
Proceeds from divestiture	70.0
Working capital retained	7.0
Transaction costs	$ 2.7
Herley | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impact of revenue				$ 1.8
Impact of operating results				2.0
Transaction-related costs		$ 1.9		2.7
Herley | 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		$ 0.1	$ 0.1	$ 0.1	$ 0.1