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Summary of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Apr. 30, 2014
Schedule Of Marketable Securities [Line Items]    
Trading $ 133,655us-gaap_TradingSecurities [1],[2] $ 116,207us-gaap_TradingSecurities [1],[2]
Less: current portion of marketable securities (13,077)us-gaap_OtherMarketableSecuritiesCurrent [1],[2] (4,510)us-gaap_OtherMarketableSecuritiesCurrent [1],[2]
Non-current marketable securities 120,578us-gaap_OtherMarketableSecuritiesNoncurrent [1],[2] 111,697us-gaap_OtherMarketableSecuritiesNoncurrent [1],[2]
Available-for-Sale 15,214us-gaap_AvailableForSaleSecuritiesDebtSecurities [2] 18,352us-gaap_AvailableForSaleSecuritiesDebtSecurities [2]
Less: current portion of marketable securities (15,214)us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent [2] (5,056)us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent [2]
Non-current marketable securities   13,296us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent [2]
Total 148,869us-gaap_MarketableSecurities 134,559us-gaap_MarketableSecurities
Less: current portion of marketable securities (28,291)us-gaap_MarketableSecuritiesCurrent (9,566)us-gaap_MarketableSecuritiesCurrent
Non-current marketable securities 120,578us-gaap_MarketableSecuritiesNoncurrent 124,993us-gaap_MarketableSecuritiesNoncurrent
Mutual Funds    
Schedule Of Marketable Securities [Line Items]    
Trading 133,655us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= kfy_MutualFundsMember		 [1],[2] 116,207us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= kfy_MutualFundsMember		 [1],[2]
Total 133,655us-gaap_MarketableSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= kfy_MutualFundsMember		 116,207us-gaap_MarketableSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= kfy_MutualFundsMember
Corporate Bonds    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale 15,214us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 [2] 18,352us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 [2]
Total $ 15,214us-gaap_MarketableSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 $ 18,352us-gaap_MarketableSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
[1] These investments are held in trust for settlement of the Company's vested and unvested obligations of $127.8 million and $117.6 million as of January 31, 2015 and April 30, 2014, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During the three months ended January 31, 2015, the fair value of investments decreased; therefore, the Company recognized a loss of $0.2 million, which was recorded in other (loss) income, net. For the nine months ended January 31, 2015, the fair value of the investments increased; therefore, the Company recognized income of $4.3 million, which was recorded in other (loss) income, net. During the three and nine months ended January 31, 2014, the fair value of the investments increased; therefore, the Company recognized income of $1.2 million and $7.6 million, respectively, which was recorded in other (loss) income, net.
[2] The Company's financial assets measured at fair value on a recurring basis include trading securities classified as Level 1 and available-for-sale securities classified as Level 2. As of January 31, 2015 and April 30, 2014, the Company had no investments classified as Level 3.