XML 71 R56.htm IDEA: XBRL DOCUMENT
v3.22.2

Deferred Compensation and Retirement Plans - Additional Information (Detail) | 12 Months Ended
--- | ---
Apr. 30, 2022 USD ($) Person Jurisdiction | Apr. 30, 2021 USD ($) Person | Apr. 30, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Recognized investment income(expense) | $ (12,000,000.0) | $ 38,500,000 | $ (1,800,000)
Increase in market value of the underlying COLI investments | 5,819,000 | 13,017,000 | 6,551,000
Net CSV | 183,308,000 | 161,295,000 |
CSV of COLI Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Outstanding policy loans | 79,800,000 | 80,000,000.0 |
Total death benefits payable, net of loans | 449,300,000 | 443,900,000 |
Increase in market value of the underlying COLI investments | 5,800,000 | 13,000,000.0 | 6,600,000
Net CSV | $ 183,300,000 | 161,300,000 |
Maximum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation range | 60.00% |  |
Maximum | Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation range | 60.00% |  |
Minimum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation range | 40.00% |  |
Minimum | Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation range | 40.00% |  |
Long Term Performance Unit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of payments after the seventh anniversary of the grant date | 5 years |  |
Vesting percentage on each anniversary date | 25.00% |  |
Long Term Performance Unit Plan | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Value per unit award | $ 50,000 |  |
Annual Benefit Payments per vested unit after anniversary period | 25,000 |  |
Long Term Performance Unit Plan | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Value per unit award | 25,000 |  |
Annual Benefit Payments per vested unit after anniversary period | $ 12,500 |  |
Enhanced Wealth Accumulation Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Participant contribution period towards deferred compensation plans (in years) | 8 years |  |
Participant after tax contribution period towards deferred compensation plans (in years) | 15 years |  |
Additional deferred units to acquire (in years) | 5 years |  |
Medical and Life Insurance plan | Hay Group |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit plan, number of participants | Person | 111 |  |
Total benefit obligation | $ 5,365,000 | 6,584,000 | 7,527,000
International Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of foreign jurisdictions | Jurisdiction | 25 |  |
Total benefit obligation | $ 14,400,000 | $ 15,600,000 |
Long-term benefit obligation accrued, number of participants | Person | 3,568 | 2,557 |
Company's contributions | $ 14,800,000 | $ 12,700,000 |
Executive Capital Accumulation Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit obligation | 166,723,000 | 163,582,000 | 129,315,000
Company's contributions | $ 7,500,000 | 8,200,000 | 9,000,000.0
Deferred compensation arrangement vesting period | 5 years |  |
Gain (loss) on deferred compensation plan | $ (10,600,000) | 37,300,000 | (800,000)
Company's contributions, unamortized portion | 18,200,000 | 20,200,000 |
Defined Contribution Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company's matching contributions next fiscal year | 3,200,000 |  |
Company's matching contributions | $ 2,100,000 | 3,000,000.0 | 0
Percentage contribution by the participants to defined contribution plan | 50.00% |  |
Deferred Compensation Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit obligation | $ 211,598,000 | 205,740,000 | $ 180,821,000
Deferred Compensation Plan | CSV of COLI Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Gross CSV | 263,200,000 | 241,300,000 |
Outstanding policy loans | 79,800,000 | $ 80,000,000.0 |
Company Owned Life Insurance Held In Trust | CSV of COLI Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net CSV | 162,800,000 |  |
Total death benefits, net of loans held in trust | $ 400,600,000 |  |

X
- Definition Benefit Obligation Accrued Number Of Participants + References No definition available. + Details
Name: | kfy_BenefitObligationAccruedNumberOfParticipants
Namespace Prefix: | kfy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash Surrender Value of Life Insurance Gross + References No definition available. + Details
Name: | kfy_CashSurrenderValueOfLifeInsuranceGross
Namespace Prefix: | kfy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Death Benefits Payable Net Of Loans + References No definition available. + Details
Name: | kfy_DeathBenefitsPayableNetOfLoans
Namespace Prefix: | kfy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Death Benefits Payable Net Of Loans Held In Trust + References No definition available. + Details
Name: | kfy_DeathBenefitsPayableNetOfLoansHeldInTrust
Namespace Prefix: | kfy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The compensation expense or income recognized during the period pertaining to the deferred compensation arrangement. + References No definition available. + Details
Name: | kfy_DeferredCompensationArrangementWithIndividualCompensationExpenseIncome
Namespace Prefix: | kfy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of Company contributions that is unamortized but will be expensed in future period once the conditions are met. + References No definition available. + Details
Name: | kfy_DeferredCompensationArrangementWithIndividualEmployerContributionUnamortizedPortion
Namespace Prefix: | kfy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Defined benefit plan number of plan participants. + References No definition available. + Details
Name: | kfy_DefinedBenefitPlanNumberOfPlanParticipants
Namespace Prefix: | kfy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The annual payments that will be made for five years commencing on the seventh anniversary of the grant date. + References No definition available. + Details
Name: | kfy_DefinedBenefitPlanPaymentAwardMaximumEmployeeSubscriptionValue
Namespace Prefix: | kfy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of years that the participant will obtain the annual benefit of $25,000 commencing on the seventh anniversary of the grant date. + References No definition available. + Details
Name: | kfy_DefinedBenefitPlanPaymentAwardPaymentsAfterAnniversaryPeriod
Namespace Prefix: | kfy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The base value per unit that will be used to determine payment that would be made upon early termination for a partially vested unit award. + References No definition available. + Details
Name: | kfy_DefinedBenefitPlanPaymentAwardValuePerUnit
Namespace Prefix: | kfy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Vesting percentage of the award on each anniversary date. + References No definition available. + Details
Name: | kfy_DefinedBenefitPlanPaymentAwardVestingRightsPercentage
Namespace Prefix: | kfy_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of foreign jurisdictions. + References No definition available. + Details
Name: | kfy_NumberOfForeignJurisdictions
Namespace Prefix: | kfy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of years the participant will receive payments from the plan once the participant meets the requirements under the plan. + References No definition available. + Details
Name: | kfy_ParticipantAfterTaxContributionPeriodTowardsDeferredCompensationPlans
Namespace Prefix: | kfy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of years that the participant is required to contribute into the plan. + References No definition available. + Details
Name: | kfy_ParticipantContributionPeriodTowardsDeferredCompensationPlans
Namespace Prefix: | kfy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of years that the participants were able to acquire additional "deferral units" under the plan. + References No definition available. + Details
Name: | kfy_PeriodToAcquireAdditionalDeferredUnits
Namespace Prefix: | kfy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Policy Loans Payable + References No definition available. + Details
Name: | kfy_PolicyLoansPayable
Namespace Prefix: | kfy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CashSurrenderValueOfLifeInsurance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714 + Details
Name: | us-gaap_EquitySecuritiesFvNiGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The change in cash surrender or contract value during the period which adjusted the amount of premiums paid in determining the expense or income recognized under the contract for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 30 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6384439&loc=d3e42048-111605 + Details
Name: | us-gaap_LifeInsuranceCorporateOrBankOwnedChangeInValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=kfy_CSVOfColiContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanDebtSecurityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis=kfy_LongTermPerformanceUnitPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=kfy_EnhancedWealthAccumulationPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=kfy_MedicalAndLifeInsuranceBenefitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=kfy_HayGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=kfy_InternationalRetirementPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=kfy_ExecutiveCapitalAccumulationPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=kfy_DefinedContributionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=kfy_DeferredCompensationPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=kfy_CompanyOwnedLifeInsuranceHeldInTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |