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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jul. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amounts of Goodwill
The carrying amounts of goodwill by applicable reporting unit were as follows:
(in thousands)Signal IntegrityWireless and SensingProtectionTotal
Balance at January 26, 2020$274,085 $72,128 $4,928 $351,141 
Balance at July 26, 2020$274,085 $72,128 $4,928 $351,141 
Schedule of Finite-lived Intangible Assets Acquired
The following table sets forth the Company’s finite-lived intangible assets resulting from business acquisitions, which are amortized over their estimated useful lives:
 July 26, 2020January 26, 2020
(in thousands, except estimated useful life)Estimated
Useful Life		Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
Core technologies3-8 years$43,300 $(28,148)$15,152 $82,857 $(63,434)$19,423 
Customer relationships— — — 6,000 (5,411)589 
Total finite-lived intangible assets$43,300 $(28,148)$15,152 $88,857 $(68,845)$20,012 
 Amortization expense of finite-lived intangible assets recorded in the Statements of Income for each period was as follows:
Three Months EndedSix Months Ended
(in thousands)July 26, 2020July 28, 2019July 26, 2020July 28, 2019
Core technologies$1,798 $3,475 $4,271 $7,634 
Customer relationships222 433 589 1,417 
Total amortization expense$2,020 $3,908 $4,860 $9,051 
Schedule of Future Amortization of Intangible Asset
Future amortization expense of finite-lived intangible assets is expected as follows:
(in thousands)
Fiscal Year Ending:
Fiscal year 2021 (remaining six months)$3,406 
Fiscal year 20224,942 
Fiscal year 20234,002 
Fiscal year 20241,676 
Fiscal year 2025287 
Thereafter839 
Total expected amortization expense$15,152