Divestiture (Details) - Defense And Microwave Communications Infrastructure Business [Member] - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jul. 26, 2015	Apr. 26, 2015	Jul. 27, 2014	Jul. 26, 2015	Jul. 27, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues and NRE reimbursements	$ 0.2		$ 2.8	$ 4.3	$ 4.6
Noncash divestiture, description		Under the terms of the transaction, the Company contributed assets, including inventory and equipment with a net book value of $0.6 million in exchange for an equity interest in the form of preferred stock, representing an approximately 21% voting interest in Jariet. Due to the anticipated continuing cash flows from its investment in Jariet, the Company did not account for the divestiture as a discontinued operation. In addition to the contribution of assets, certain contracts have been novated with future performance responsibilities being transferred to Jariet. Additional contracts are in the process of being novated with the intent of transferring performance responsibilities to Jariet.
Net book value of contributed assets		$ 0.6
Type of consideration received		equity interest in the form of preferred stock
Voting interest acquired		21.00%