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Marketable Securities - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Apr. 30, 2014
Schedule Of Marketable Securities [Line Items]          
Proceeds from sales/maturities of available-for-sale securities $ 1,000,000us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities $ 0us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities $ 3,000,000us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities $ 33,300,000us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities  
Trading securities 133,655,000us-gaap_TradingSecurities [1],[2]   133,655,000us-gaap_TradingSecurities [1],[2]   116,207,000us-gaap_TradingSecurities [1],[2]
Gross unrealized gains 4,800,000kfy_TradingSecuritiesUnrealizedHoldingGainAccumulatedInInvestments   4,800,000kfy_TradingSecuritiesUnrealizedHoldingGainAccumulatedInInvestments   9,200,000kfy_TradingSecuritiesUnrealizedHoldingGainAccumulatedInInvestments
Gross unrealized losses $ 300,000kfy_TradingSecuritiesUnrealizedHoldingLossAccumulatedInInvestments   $ 300,000kfy_TradingSecuritiesUnrealizedHoldingLossAccumulatedInInvestments   $ 700,000kfy_TradingSecuritiesUnrealizedHoldingLossAccumulatedInInvestments
Minimum          
Schedule Of Marketable Securities [Line Items]          
Available-for-sale marketable securities, remaining maturities     1 month    
Maximum          
Schedule Of Marketable Securities [Line Items]          
Available-for-sale marketable securities, remaining maturities     1 year    
[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.