Segment Information - Net Sales Activity by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
Jan. 31, 2021	Jan. 26, 2020	Jan. 27, 2019
Revenue from External Customer [Line Items]
Net sales	$ 595,117	$ 547,512	$ 627,196
Semiconductor Products Group
Revenue from External Customer [Line Items]
Net sales	$ 595,117	$ 547,512	$ 627,196

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details