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Acquisition-Related Intangible Assets, Net
 9 Months Ended
Oct. 31, 2021
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, 2021January 31, 2021
Developed technology$319,300 $218,400 
Customer relationships298,100 223,000 
Trade name12,500 12,000 
Backlog15,000 11,000 
Acquisition-related intangible assets, gross644,900 464,400 
Less accumulated amortization(273,242)(215,774)
Acquisition-related intangible assets, net$371,658 $248,626 
Amortization expense related to acquisition-related intangible assets was $19 million and $14 million for the three months ended October 31, 2021, and 2020, respectively, and $57 million and $46 million for the nine months ended October 31, 2021, and 2020, respectively.
As of October 31, 2021, our future estimated amortization expense related to acquisition-related intangible assets was as follows (in thousands):
Fiscal Period:
Remainder of 2022$20,011 
202377,786 
202466,569 
202553,913 
202648,560 
Thereafter104,819 
Total$371,658