v3.26.1
Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Apr. 30, 2026
Goodwill [Roll Forward]      
Balance at beginning of period $ 203,930 $ 158,029  
Goodwill acquired during the period 3,017 46,969  
NDS Canada purchase price allocation adjustment   845  
Foreign currency translation (957) (1,068)  
Balance at end of period 206,835 203,930  
Invision Digital Pty Ltd      
Goodwill [Roll Forward]      
Acquisition of remaining voting equity interest     100.00%
Operating Segments | Loan Servicing and Systems      
Goodwill [Roll Forward]      
Balance at beginning of period 69,540 23,639  
Goodwill acquired during the period 0 46,969  
NDS Canada purchase price allocation adjustment   845  
Foreign currency translation (845) (1,068)  
Balance at end of period 69,540 69,540  
Operating Segments | Education Technology Services and Payments      
Goodwill [Roll Forward]      
Balance at beginning of period 92,507 92,507  
Goodwill acquired during the period 3,017 0  
NDS Canada purchase price allocation adjustment   0  
Foreign currency translation (112) 0  
Balance at end of period 95,412 92,507  
Operating Segments | Asset Generation and Management      
Goodwill [Roll Forward]      
Balance at beginning of period 41,883 41,883  
Goodwill acquired during the period 0 0  
NDS Canada purchase price allocation adjustment   0  
Foreign currency translation 0 0  
Balance at end of period 41,883 41,883  
Operating Segments | Nelnet Bank      
Goodwill [Roll Forward]      
Balance at beginning of period 0 0  
Goodwill acquired during the period 0 0  
NDS Canada purchase price allocation adjustment   0  
Foreign currency translation 0 0  
Balance at end of period 0 0  
NFS Other Operating Segments      
Goodwill [Roll Forward]      
Balance at beginning of period 0 0  
Goodwill acquired during the period 0 0  
NDS Canada purchase price allocation adjustment   0  
Foreign currency translation 0 0  
Balance at end of period 0 0  
Corporate and Other Activities      
Goodwill [Roll Forward]      
Balance at beginning of period 0 0  
Goodwill acquired during the period 0 0  
NDS Canada purchase price allocation adjustment   0  
Foreign currency translation 0 0  
Balance at end of period $ 0 $ 0