Stock-Based Compensation - Allocation of Stock-based Compensation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, pre-tax	$ 29,629	$ 24,589	$ 24,528
Net change in stock-based compensation capitalized out of (into) inventory	111	36	(33)
Cost of sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, pre-tax	1,621	1,664	1,218
Selling, general and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, pre-tax	17,387	12,071	14,965
Product development and engineering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, pre-tax	$ 10,621	$ 10,854	$ 8,345