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Goodwill and Intangible Assets
 9 Months Ended
Oct. 25, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
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 October 25, 2020$274,085 $72,128 $4,928 $351,141 
Goodwill is not amortized, but is tested for impairment at the reporting unit level using either a qualitative or quantitative assessment on an annual basis during the fourth quarter of each fiscal year, and whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The recoverability of goodwill is measured at the reporting unit level by comparing the reporting unit’s carrying amount, including goodwill, to the fair market value of the reporting unit. As of October 25, 2020, there was no indication of impairment of the Company's goodwill balances.
Purchased Intangibles
The following table sets forth the Company’s finite-lived intangible assets resulting from business acquisitions, which are amortized over their estimated useful lives:
 October 25, 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 technologies
3-8 years
$43,300 $(29,946)$13,354 $82,857 $(63,434)$19,423 
Customer relationships— — — 6,000 (5,411)589 
Total finite-lived intangible assets$43,300 $(29,946)$13,354 $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 EndedNine Months Ended
(in thousands)October 25, 2020October 27, 2019October 25, 2020October 27, 2019
Core technologies$1,798 $3,337 $6,069 $10,971 
Customer relationships— 433 589 1,850 
Total amortization expense$1,798 $3,770 $6,658 $12,821 
Future amortization expense of finite-lived intangible assets is expected as follows:
(in thousands)
Fiscal Year Ending:
Fiscal year 2021 (remaining three months)$1,608 
Fiscal year 20224,942 
Fiscal year 20234,002 
Fiscal year 20241,676 
Fiscal year 2025288 
Thereafter838 
Total expected amortization expense$13,354