Condensed Consolidated Balance Sheets (undaudited) (Parenthetical) - USD ($) $ in Thousands	Apr. 26, 2020	Jan. 26, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, receivables	$ 515	$ 633
Accumulated depreciation	$ 220,398	$ 214,787
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	78,136,144	78,136,144
Common stock, shares outstanding	65,132,030	65,758,115
Treasury stock, shares	13,004,114	12,378,029