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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2)
 3 Months Ended 4 Months Ended
Mar. 31, 2015
method
approach
Apr. 30, 2014
grade
category
component
Consolidation    
Minimum percentage of voting interest required to consolidate non-VIEs 50.00%kfn_MinimumPercentVotingInterestInEntityOtherThanVariableInterestEntityForConsolidation  
Fair Value of Financial Instruments    
Number of approaches used to determine fair value of investments (in approaches) 2kfn_NumberOfApproachesUsedToDetermineFairValueOfInvestments  
Corporate Loans    
Period for determination of non-accrual status 90 days  
Number of methods interest income recognized 2kfn_ImpairedFinancingReceivableInterestIncomeNumberOfMethodsRecognized  
Sustained period of repayment performance 6 months  
Predecessor Company    
Summary of corporate loans    
Number of loan categories   3kfn_NumberOfLoanCategories
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Allowance for Loan Losses    
Number of components in the loans receivable allowance for loan losses (in components)   2kfn_LoansReceivableAllowanceForLoanLossesNumberOfComponents
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Number of internally assigned risk grades   3kfn_NumberOfInternallyAssignedRiskGrades
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember