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Revenue Recognition
 6 Months Ended
Jul. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
Disaggregation of Revenue
The following tables summarize revenue by geographical region (dollars in thousands): 
Three Months Ended July 31,
20222021
AmountPercentage of
Revenue		AmountPercentage of
Revenue
Americas (1)
$120,977 50 %$89,266 46 %
Europe, Middle East, and Africa69,521 29 %60,405 31 %
Asia-Pacific (2)
51,724 21 %45,850 23 %
Total revenue$242,222 100 %$195,521 100 %
(1)Revenue from the United States represented 45% and 42% of our total revenues for the three months ended July 31, 2022 and 2021, respectively.
(2)Revenue from Japan represented 9% and 12% of our total revenues for the three months ended July 31, 2022 and 2021, respectively.
Six Months Ended July 31,
20222021
AmountPercentage of
Revenue		AmountPercentage of
Revenue
Americas (1)
$235,128 48 %$173,892 46 %
Europe, Middle East, and Africa139,124 29 %110,489 29 %
Asia-Pacific (2)
113,036 23 %97,357 25 %
Total revenue$487,288 100 %$381,738 100 %
(1)Revenue from the United States represented 44% and 41% of our total revenues for the six months ended July 31, 2022 and 2021, respectively.
(2)Revenue from Japan represented 11% and 14% of our total revenues for the six months ended July 31, 2022 and 2021, respectively.
Deferred Revenue
During the six months ended July 31, 2022 and 2021, we recognized $201.9 million and $137.8 million of revenue that was included in the deferred revenue balance as of January 31, 2022 and 2021, respectively.
Remaining Performance Obligations
Our remaining performance obligations are comprised of licenses, subscription services, and professional services and other revenue not yet delivered. As of July 31, 2022, the aggregate amount of the transaction price allocated to remaining performance obligations was $709.0 million, which consists of $358.9 million of billed consideration and $350.1 million of unbilled consideration. We expect to recognize 62% of our remaining performance obligations as revenue over the next 12 months, and the remainder thereafter.
Deferred Contract Acquisition Costs
Our deferred contract acquisition costs are comprised of sales commissions that represent incremental costs to obtain customer contracts, and are determined based on sales compensation plans. Amortization of deferred contract acquisition costs was $11.1 million and $6.1 million for the three months ended July 31, 2022 and 2021, respectively, and $21.9 million and $11.0 million for the six months ended July 31, 2022 and 2021, respectively.