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Consolidated Schedule of Investments - Forward Foreign Currency Exchange Contracts
€ in Thousands, £ in Thousands, kr in Thousands, $ in Thousands, $ in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2022
EUR (€)
Sep. 30, 2022
GBP (£)
Sep. 30, 2022
NOK (kr)
Sep. 30, 2022
AUD ($)
Sep. 30, 2022
CAD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
AUD ($)
Consolidated Schedule of Investments                    
Unrealized Appreciation (Depreciation) $ 12,886                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 1,458, Purchased And POUND STERLING 1,100, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased   $ 1,458                
Currency Sold | £                 £ 1,100  
Counterparty   bcsf:BankOfNewYorkMellonMember           bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember
Settlement Date   Feb. 18, 2022                
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 1,777, Purchased And POUND STERLING 1,530, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 1,777                  
Currency Sold | £       £ 1,530            
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Mar. 16, 2023                  
Unrealized Appreciation (Depreciation) $ 71                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 1,804, Purchased And CANADIAN DOLLARS 2,360, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 1,804                  
Currency Sold             $ 2,360      
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Mar. 03, 2023                  
Unrealized Appreciation (Depreciation) $ 92                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 1,990, Purchased And EURO 1,900, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 1,990                  
Currency Sold | €     € 1,900              
Counterparty Citibank   Citibank Citibank Citibank Citibank Citibank      
Settlement Date Jan. 09, 2023                  
Unrealized Appreciation (Depreciation) $ 114                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 10,773, Purchased And EURO 9,890, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 10,773                  
Currency Sold | €     € 9,890              
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date May 17, 2024                  
Unrealized Appreciation (Depreciation) $ 745                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 10,917, Purchased And POUND STERLING 9,440, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 10,917                  
Currency Sold | £       £ 9,440            
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Mar. 03, 2023                  
Unrealized Appreciation (Depreciation) $ 385                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 11,215, Purchased And POUND STERLING 9,000, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 11,215                  
Currency Sold | £       £ 9,000            
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Jun. 24, 2024                  
Unrealized Appreciation (Depreciation) $ 1,162                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 11,848, Purchased And POUND STERLING 9,890, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 11,848                  
Currency Sold | £       £ 9,890            
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Feb. 17, 2023                  
Unrealized Appreciation (Depreciation) $ 811                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 12,327, Purchased And AUSTRALIAN DOLLARS 17,960, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 12,327                  
Currency Sold           $ 17,960        
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Jul. 28, 2025                  
Unrealized Appreciation (Depreciation) $ 815                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 12,327, Purchased And EURO 10,510, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased   $ 12,327                
Currency Sold | €               € 10,510    
Counterparty   Citibank           Citibank Citibank Citibank
Settlement Date   Sep. 02, 2022                
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 14,330, Purchased And EURO 12,550, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased   $ 14,330                
Currency Sold | €               € 12,550    
Counterparty   bcsf:BankOfNewYorkMellonMember           bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember
Settlement Date   Sep. 06, 2022                
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 24,349, Purchased And POUND STERLING 19,320, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 24,349                  
Currency Sold | £       £ 19,320            
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Nov. 17, 2023                  
Unrealized Appreciation (Depreciation) $ 2,957                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 27,411, Purchased And POUND STERLING 20,700, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased   $ 27,411                
Currency Sold | £                 £ 20,700  
Counterparty   bcsf:BankOfNewYorkMellonMember           bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember
Settlement Date   Sep. 06, 2022                
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 29,087, Purchased And POUND STERLING 20,990, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased   $ 29,087                
Currency Sold | £                 £ 20,990  
Counterparty   bcsf:BankOfNewYorkMellonMember           bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember
Settlement Date   Sep. 02, 2022                
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 35,821, Purchased And POUND STERLING 25,700, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased   $ 35,821                
Currency Sold | £                 £ 25,700  
Counterparty   Citibank           Citibank Citibank Citibank
Settlement Date   Feb. 18, 2022                
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 37,234, Purchased And POUND STERLING 31,000, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 37,234                  
Currency Sold | £       £ 31,000            
Counterparty Citibank   Citibank Citibank Citibank Citibank Citibank      
Settlement Date Jan. 09, 2023                  
Unrealized Appreciation (Depreciation) $ 2,618                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 4,754, Purchased And EURO 3,251, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased   $ 4,754                
Currency Sold | €               € 3,251    
Counterparty   Citibank           Citibank Citibank Citibank
Settlement Date   Sep. 06, 2022                
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 4,945, Purchased And NORWEGIAN KRONE 48,400, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 4,945                  
Currency Sold | kr         kr 48,400          
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Feb. 17, 2023                  
Unrealized Appreciation (Depreciation) $ 479                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 41,180, Purchased And EURO 40,810, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 41,180                  
Currency Sold | €     € 40,810              
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Mar. 03, 2023                  
Unrealized Appreciation (Depreciation) $ 733                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 481, Purchased And AUSTRALIAN DOLLARS 410, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased   $ 481                
Currency Sold                   $ 410
Counterparty   bcsf:BankOfNewYorkMellonMember           bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember
Settlement Date   Mar. 02, 2022                
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 5,526, Purchased And AUSTRALIAN DOLLARS 7,750, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 5,526                  
Currency Sold           $ 7,750        
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Aug. 04, 2023                  
Unrealized Appreciation (Depreciation) $ 532                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 6,138, Purchased And POUND STERLING 5,000, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 6,138                  
Currency Sold | £       £ 5,000            
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Aug. 04, 2023                  
Unrealized Appreciation (Depreciation) $ 584                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 6,581, Purchased And EURO 6,400, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 6,581                  
Currency Sold | €     € 6,400              
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Jan. 09, 2023                  
Unrealized Appreciation (Depreciation) $ 259                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 6,954, Purchased And POUND STERLING 5,260, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased   $ 6,954                
Currency Sold | £                 £ 5,260  
Counterparty   Citibank           Citibank Citibank Citibank
Settlement Date   Feb. 23, 2022                
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 7,894, Purchased And AUSTRALIAN DOLLARS 11,440, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased $ 7,894                  
Currency Sold           $ 11,440        
Counterparty bcsf:BankOfNewYorkMellonMember   bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember      
Settlement Date Mar. 03, 2023                  
Unrealized Appreciation (Depreciation) $ 529                  
Open Forward Foreign Currency Contract, Identifier [Axis]: US DOLLARS 75,862, Purchased And EURO 63,360, Sold                    
Consolidated Schedule of Investments                    
Currency Purchased   $ 75,862                
Currency Sold | €               € 63,360    
Counterparty   bcsf:BankOfNewYorkMellonMember           bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember bcsf:BankOfNewYorkMellonMember
Settlement Date   Sep. 02, 2022