XML 106 R84.htm IDEA: XBRL DOCUMENT
v3.21.2

Long-Term Debt - Schedule of Redemption of Notes at Applicable Redemption Prices (Detail) - 4.625% Senior Unsecured Notes due 2027 | 12 Months Ended
--- | ---
Apr. 30, 2021
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 price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
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: |