XML 80 R60.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Fair Value Measurements of Defined Benefit Plan Assets (Detail) - Deferred Compensation and Pension Plans - USD ($) $ in Thousands | Apr. 30, 2018 | Apr. 30, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | $ 26,090 | $ 25,446
Mutual Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 25,899 | 25,446
Money Market Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 191 |
Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 191 |
Fair Value, Inputs, Level 1 | Money Market Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 191 |
Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 25,899 | 25,446
Fair Value, Inputs, Level 2 | Mutual Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | $ 25,899 | $ 25,446

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 Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |