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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2015
Office
Country
Jan. 31, 2014
Jan. 31, 2015
Office
Country
Jan. 31, 2014
Apr. 30, 2014
Organization And Summary Of Significant Accounting Policies [Line Items]          
Number of offices 84kfy_NumberOfOffices   84kfy_NumberOfOffices    
Number of countries in which entity operates 37us-gaap_NumberOfCountriesInWhichEntityOperates   37us-gaap_NumberOfCountriesInWhichEntityOperates    
Investments in affiliated companies maximum 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage   50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage    
Deferred revenue $ 43,000,000us-gaap_DeferredRevenue   $ 43,000,000us-gaap_DeferredRevenue   $ 36,800,000us-gaap_DeferredRevenue
Cash equivalents 203,500,000us-gaap_CashEquivalentsAtCarryingValue   203,500,000us-gaap_CashEquivalentsAtCarryingValue   186,600,000us-gaap_CashEquivalentsAtCarryingValue
Realized loss of other-than-temporary impairment 0us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount 0us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount 0us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount 0us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount  
Payment of contingent consideration from acquisitions       15,000,000kfy_PaymentOfEarnOutsFromAcquisitions  
Impairment of goodwill     0us-gaap_GoodwillImpairmentLoss   0us-gaap_GoodwillImpairmentLoss
Impairment of intangible assets     0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill   0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Performance related bonus expenses 37,800,000kfy_PerformanceRelatedBonusExpenses 36,500,000kfy_PerformanceRelatedBonusExpenses 122,100,000kfy_PerformanceRelatedBonusExpenses 104,700,000kfy_PerformanceRelatedBonusExpenses  
(Decrease) increase in performance related bonus expenses 0kfy_IncreaseDecreaseInPerformanceRelatedBonusExpenses 0kfy_IncreaseDecreaseInPerformanceRelatedBonusExpenses (300,000)kfy_IncreaseDecreaseInPerformanceRelatedBonusExpenses (700,000)kfy_IncreaseDecreaseInPerformanceRelatedBonusExpenses  
Performance related bonus after reduction in the previous year estimate     $ 121,800,000kfy_PerformanceRelatedBonusAfterReductionInPreviousYearEstimate $ 104,000,000kfy_PerformanceRelatedBonusAfterReductionInPreviousYearEstimate  
Minimum          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Intangible assets estimated useful lives     2 years    
Maximum          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Intangible assets estimated useful lives     24 years