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Credit Losses - Additional Information (Details) | 12 Months Ended
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Apr. 30, 2024
Maximum |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |
Debt instrument term | 2 years

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- Definition Fair value and unrealized losses on available for sale debt securities. + References No definition available. + Details
Name: | kfy_FairValueAndUnrealizedLossesOnAvailableForSaleDebtSecuritiesLineItems
Namespace Prefix: | kfy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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