Derivatives and Hedging Activities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 26, 2015	Jul. 31, 2016	Jul. 26, 2015
Derivative [Line Items]
Objectives for using derivative instruments			The Company is exposed to certain risk arising from both its business operations and economic conditions and principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company, on a routine basis and in the normal course of business, experiences expenses denominated in Swiss Franc (“CHF”), Canadian Dollar (“CAD”) and Great British Pound (“GBP”). Such expenses expose the Company to exchange rate fluctuations between these foreign currencies and the U.S. Dollar (“USD”). The Company uses derivative financial instruments in the form of forward contracts, to mitigate risk associated with adverse movements in these foreign currency exchange rates on a portion of foreign denominated expenses expected to be realized over the next twelve months.
Other comprehensive income (loss), net of tax	$ (1,606)	$ 84	$ 370	$ 138
Foreign Contract
Derivative [Line Items]
Other comprehensive income (loss), net of tax	$ (1,600)	$ 0	$ 300	$ 0