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N-2 - $ / shares
 3 Months Ended
Jun. 11, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Cover [Abstract]                                          
Entity Central Index Key 0001513363                                        
Amendment Flag false                                        
Document Type DEF 14A                                        
Entity Registrant Name Fidus Investment Corporation                                        
General Description of Registrant [Abstract]                                          
Share Price [Table Text Block] The following table lists the high and low sales prices for our common stock
, and the sales prices as percentages of NAV. On March 20, 2025, the last reported closing sale price of our common stock on the Nasdaq Global Select Market was $20.47.
 
Period
   
NAV
(1)
    
High

Closing

Sales

Price
     
Low

Closing

Sales

Price
     
Premium /

(Discount) of

High Sales

Price to

NAV
(2)
   
Premium /

(Discount) of

Low Sales

Price to

NAV
(2)
 
                                   
Year Ended December 31, 2024:
              
First Quarter
    $ 19.36      $ 20.04      $ 18.79        3.5 %      (2.9 )% 
Second Quarter
      19.50        20.47        19.26        5.0       (1.2 ) 
Third Quarter
      19.42        20.34        18.76        4.7       (3.4 ) 
Fourth Quarter
      19.33        21.49        19.10        11.2       (1.2 ) 
Year Ended December 31, 2023:
              
First Quarter
    $ 19.39      $ 20.90      $ 18.29        7.8 %      (5.7 )% 
Second Quarter
      19.13        20.08        18.10        5.0       (5.4 ) 
Third Quarter
      19.28        20.98        18.80        8.8       (2.5 ) 
Fourth Quarter
      19.37        20.13        17.69        3.9       (8.7 ) 
Year Ended December 31, 2022:
              
First Quarter
    $ 19.91      $ 20.52      $ 17.02        3.1 %      (14.5 )% 
Second Quarter
      19.80        20.94        16.61        5.8       (16.1 ) 
Third Quarter
      19.41        20.62        16.92        6.2       (12.8 ) 
Fourth Quarter
      19.43        20.69        16.88        6.5       (13.1 ) 
Year Ended December 31, 2021:
              
First Quarter
    $ 16.90      $ 15.67      $ 12.78        (7.3 )%      (24.4 )% 
Second Quarter
      17.57        17.89        15.70        1.8       (10.6 ) 
Third Quarter
      18.31        18.39        16.45        0.4       (10.2 ) 
Fourth Quarter
      19.96        18.63        16.97        (6.7 )      (15.0 ) 
Year Ended December 31, 2020:
              
First Quarter
    $ 15.37      $ 15.55      $ 4.72        1.2 %      (69.3 )% 
Second Quarter
      15.39        11.02        5.36        (28.4 )      (65.2 ) 
Third Quarter
      15.94        10.72        8.49        (32.7 )      (46.7 ) 
Fourth Quarter
      16.81        14.31        10.00        (14.9 )      (40.5 ) 
 
(1)
NAV per share is determined as of the last day in the relevant quarter and therefore may not reflect the NAV per share on the date of the high and low sales prices. The NAVs shown are based on outstanding shares at the end of each period.
(2)
Calculated as the respective high or low sales price divided by NAV.
                                       
Lowest Price or Bid   $ 19.1 $ 18.76 $ 19.26 $ 18.79 $ 17.69 $ 18.8 $ 18.1 $ 18.29 $ 16.88 $ 16.92 $ 16.61 $ 17.02 $ 16.97 $ 16.45 $ 15.7 $ 12.78 $ 10 $ 8.49 $ 5.36 $ 4.72
Highest Price or Bid   $ 21.49 $ 20.34 $ 20.47 $ 20.04 $ 20.13 $ 20.98 $ 20.08 $ 20.9 $ 20.69 $ 20.62 $ 20.94 $ 20.52 $ 18.63 $ 18.39 $ 17.89 $ 15.67 $ 14.31 $ 10.72 $ 11.02 $ 15.55
Highest Price or Bid, Premium (Discount) to NAV [Percent] [1]   11.20% 4.70% 5.00% 3.50% 3.90% 8.80% 5.00% 7.80% 6.50% 6.20% 5.80% 3.10% (6.70%) 0.40% 1.80% (7.30%) (14.90%) (32.70%) (28.40%) 1.20%
Lowest Price or Bid, Premium (Discount) to NAV [Percent] [1]   (1.20%) (3.40%) (1.20%) (2.90%) (8.70%) (2.50%) (5.40%) (5.70%) (13.10%) (12.80%) (16.10%) (14.50%) (15.00%) (10.20%) (10.60%) (24.40%) (40.50%) (46.70%) (65.20%) (69.30%)
NAV Per Share [2]   $ 19.33 $ 19.42 $ 19.5 $ 19.36 $ 19.37 $ 19.28 $ 19.13 $ 19.39 $ 19.43 $ 19.41 $ 19.8 $ 19.91 $ 19.96 $ 18.31 $ 17.57 $ 16.9 $ 16.81 $ 15.94 $ 15.39 $ 15.37
[1] Calculated as the respective high or low sales price divided by NAV.
[2] NAV per share is determined as of the last day in the relevant quarter and therefore may not reflect the NAV per share on the date of the high and low sales prices. The NAVs shown are based on outstanding shares at the end of each period.