XML 83 R59.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Deferred Compensation And Retirement Plans (Reconciliation Of Benefit Obligation) (Parenthetical) (Detail) - CSV of COLI Contracts - USD ($) $ in Millions | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Gross CSV | $ 180.3 | $ 175.7 |
Outstanding policy loans | 67.2 | 68.4 |
Deferred Compensation Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Gross CSV | 180.3 | 175.7 | $ 172.3
Outstanding policy loans | $ 67.2 | $ 68.4 | $ 69.6

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

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