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Segment Information - Income by Segment and Reconciliation to Income Before Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2021
Jan. 26, 2020
Jan. 27, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) $ 74,956 $ 52,009 $ 105,499
Share-based compensation 52,986 52,049 66,837
Investment impairments and credit loss reserves 6,769 1,211 30,000
Changes in the fair value of contingent earn-out obligations (33) (2,345) (9,419)
Gain (Loss) Related to Litigation Settlement 1,263 1,340 (6,137)
Non-operating (income) expense, net 124 2,893 3,823
Income before taxes 62,975 44,585 70,120
Operating Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) 139,535 124,911 186,975
Operating Segments | Semiconductor Products Group      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) 139,535 124,911 186,975
Segment Reconciling Items      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Share-based compensation 52,986 52,049 66,837
Intangible amortization 8,265 16,546 26,649
Investment impairments and credit loss reserves 6,769 1,211 30,000
Changes in the fair value of contingent earn-out obligations (33) (2,345) (9,419)
Transaction and integration related 784 691 2,777
Interest expense 5,336 9,106 9,202
Non-operating (income) expense, net (124) (2,893) (3,823)
Corporate, Non-Segment      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Restructuring Costs $ 1,314 $ 4,621 $ 769