XML 100 R83.htm IDEA: XBRL DOCUMENT
v3.20.2

Long-Term Debt - Schedule of Redemption of Notes at Applicable Redemption Prices (Detail) - 4.625% Senior Unsecured Notes due 2027 |  | 12 Months Ended
--- | --- | ---
Dec. 16, 2019 | Apr. 30, 2020
Debt Instrument [Line Items] |  |
Redemption price, percentage | 104.625% |
2022 |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage |  | 102.313%
2023 |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage |  | 101.156%
2024 and thereafter |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage |  | 100.00%

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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of principal amount of debt redeemed. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=kfy_FourPointSixTwoFivePercentSeniorUnsecuredNotesDueTwoThousandTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=kfy_DebtInstrumentRedemptionPeriodFourAndAfterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |