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Goodwill and Intangible Assets - Future Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Thousands
Jan. 28, 2018
Jan. 29, 2017
Fiscal year 2019 $ 26,399  
Fiscal year 2020 15,522  
Fiscal year 2021 6,978  
Fiscal year 2022 3,905  
Fiscal year 2023 3,714  
Thereafter 1,389  
Total expected amortization expense 57,907 $ 61,773
Core technologies    
Fiscal year 2019 20,666  
Fiscal year 2020 13,239  
Fiscal year 2021 6,389  
Fiscal year 2022 3,905  
Fiscal year 2023 3,714  
Thereafter 1,389  
Total expected amortization expense 49,302 51,990
Customer relationships    
Fiscal year 2019 5,733  
Fiscal year 2020 2,283  
Fiscal year 2021 589  
Fiscal year 2022 0  
Fiscal year 2023 0  
Thereafter 0  
Total expected amortization expense $ 8,605 $ 9,783