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N-2 - $ / shares
 3 Months Ended 12 Months Ended
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
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2023
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 21, 2024, the last reported closing sale price of our common stock on the Nasdaq Global Select Market was $19.04.
 
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)
   
Dividends

Declared
Per Share
(3)
  
Year Ended December 31, 2023:
                
First Quarter
    $ 19.39      $ 20.90      $ 18.29        7.8 %      (5.7 )%    $ 0.66  
Second Quarter
      19.13        20.08        18.10        5.0       (5.4 )      0.70  
Third Quarter
      19.28        20.98        18.80        8.8       (2.5 )      0.72  
Fourth Quarter
      19.37        20.13        17.69        3.9       (8.7 )      0.80  
Year Ended December 31, 2022:
                
First Quarter
    $ 19.91      $ 20.52      $ 17.02        3.1 %      (14.5 )%    $ 0.53  
Second Quarter
      19.80        20.94        16.61        5.8       (16.1 )      0.43  
Third Quarter
      19.41        20.62        16.92        6.2       (12.8 )      0.43  
Fourth Quarter
      19.43        20.69        16.88        6.5       (13.1 )      0.61  
Year Ended December 31, 2021:
                
First Quarter
    $ 16.90      $ 15.67      $ 12.78        (7.3 )%      (24.4 )%    $ 0.38  
Second Quarter
      17.57        17.89        15.70        1.8       (10.6 )      0.39  
Third Quarter
      18.31        18.39        16.45        0.4       (10.2 )      0.42  
Fourth Quarter
      19.96        18.63        16.97        (6.7 )      (15.0 )      0.41  
Year Ended December 31, 2020:
                
First Quarter
    $ 15.37      $ 15.55      $ 4.72        1.2 %      (69.3 )%    $ 0.39  
Second Quarter
      15.39        11.02        5.36        (28.4 )      (65.2 )      0.30  
Third Quarter
      15.94        10.72        8.49        (32.7 )      (46.7 )      0.30  
Fourth Quarter
      16.81        14.31        10.00        (14.9 )      (40.5 )      0.34  
Year Ended December 31, 2019:
                
First Quarter
    $ 16.55      $ 15.68      $ 11.90        (5.3 )%      (28.1 )%    $ 0.39  
Second Quarter
      16.29        16.47        15.33        1.1       (5.9 )      0.39  
Third Quarter
      16.47        16.33        14.49        (0.9 )      (12.0 )      0.39  
Fourth Quarter
      16.85        16.06        14.17        (4.7 )      (15.9 )      0.43  
 
(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.
(3)
Represents the distribution declared in the specified quarter. We have adopted an “opt out” dividend reinvestment plan for our common stockholders. As a result, if we declare a distribution, then stockholders’ cash distributions will be automatically reinvested in additional shares of our common stock, unless they specifically “opt out” of the dividend reinvestment plan so as to receive cash distributions.
Lowest Price or Bid $ 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 $ 14.17 $ 14.49 $ 15.33 $ 11.9  
Highest Price or Bid $ 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 $ 16.06 $ 16.33 $ 16.47 $ 15.68  
Highest Price or Bid, Premium (Discount) to NAV [Percent] [1] 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% (4.70%) (0.90%) 1.10% (5.30%)  
Lowest Price or Bid, Premium (Discount) to NAV [Percent] [1] (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%) (15.90%) (12.00%) (5.90%) (28.10%)  
NAV Per Share [2] $ 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 $ 16.85 $ 16.47 $ 16.29 $ 16.55 $ 19.37
[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.