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Acquisition-Related Intangible Assets, Net
 9 Months Ended
Oct. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Acquisition-Related Intangible Assets, Net Acquisition-Related Intangible Assets, Net
Acquisition-related intangible assets, net consisted of the following (in thousands):
October 31, 2022January 31, 2022
Developed technology$346,300 $346,300 
Customer relationships311,100 311,100 
Backlog15,000 15,000 
Trade name12,500 12,500 
Acquisition-related intangible assets, gross684,900 684,900 
Less accumulated amortization(358,230)(293,898)
Acquisition-related intangible assets, net$326,670 $391,002 
Amortization expense related to acquisition-related intangible assets was $21 million and $19 million for the three months ended October 31, 2022, and 2021, respectively, and $64 million and $57 million for the nine months ended October 31, 2022, and 2021, respectively.
As of October 31, 2022, our future estimated amortization expense related to acquisition-related intangible assets was as follows (in thousands):
Fiscal Period:
Remainder of 2023$21,204 
202474,319 
202561,663 
202655,748 
202731,177 
Thereafter82,559 
Total$326,670