v3.26.1
Cover Page - shares
 3 Months Ended
Jul. 03, 2026
Jul. 24, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jul. 03, 2026  
Document Transition Report false  
Entity File Number 001-41617  
Entity Registrant Name Nextpower Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 36-5047383  
Entity Address, Address Line One 6200 Paseo Padre Parkway  
Entity Address, City or Town Fremont  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94555  
City Area Code 510  
Local Phone Number 270-2500  
Title of 12(b) Security Class A Common Stock, $0.0001 par value  
Trading Symbol NXT  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Central Index Key 0001852131  
Document Fiscal Year Focus 2027  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Current Fiscal Year End Date --03-31  
Common Class A    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   151,729,520
Common Class B    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   0