Divestiture (Details) (Defense And Microwave Communications Infrastructure Business [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 26, 2015	Apr. 27, 2014
Defense And Microwave Communications Infrastructure Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues and NRE reimbursements	$ 4.1	$ 1.9
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 its equity interest in Jariet and the anticipated continuing cash flows from that equity interest, 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%