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Goodwill and Intangible Assets
 9 Months Ended
Oct. 31, 2021
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 31, 2021$274,085 $72,128 $4,928 $351,141 
Balance at October 31, 2021$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 31, 2021, 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 and technology licenses purchased, which are amortized over their estimated useful lives:
 October 31, 2021January 31, 2021
(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
6-8 years
$26,300 $(18,448)$7,852 $29,300 $(17,554)$11,746 
Total finite-lived intangible assets$26,300 $(18,448)$7,852 $29,300 $(17,554)$11,746 
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 31, 2021October 25, 2020October 31, 2021October 25, 2020
Core technologies$1,298 $1,798 $3,894 $6,069 
Customer relationships— — — 589 
Total amortization expense$1,298 $1,798 $3,894 $6,658 
Future amortization expense of finite-lived intangible assets is expected as follows:
(in thousands)
Fiscal Year Ending:
2022 (remaining three months)$1,048 
20234,002 
20241,676 
2025288 
2026288 
Thereafter550 
Total expected amortization expense$7,852