Divestitures - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 30, 2016	Oct. 25, 2015	Oct. 30, 2016	Oct. 25, 2015	Aug. 05, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposition of business operations	$ 25,036	$ 0	$ 25,036	$ 0
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		$ 200		$ 4,300
Noncash divestiture, description		Under the terms of the transaction with Jariet, 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 were novated with future performance responsibilities being transferred to Jariet. The investment in Jariet was written off in the third quarter of fiscal year 2016.
Net book value of contributed assets		$ 600
Type of consideration received		equity interest in the form of preferred stock
Voting interest acquired		21.00%
Systems Innovation [Member] | Snowbush IP Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration received related to divestiture					$ 32,000
Gain on Disposition of Business Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposition of business operations	$ 25,036