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Segments - Long Lived Assets, Excluding Financial Instruments and Tax Assets, Classified by Controlling Countries over Ten Percent (Detail) - USD ($) $ in Thousands | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
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Segment Reporting Information [Line Items] |  |  |  |
Long-lived assets |  | $ 337,805 | $ 131,505 | $ 119,901
UNITED STATES |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Long-lived assets | [1] | 169,928 | 98,455 | 80,424
United Kingdom |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Long-lived assets |  | 35,739 | 6,466 | 7,792
Other Countries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Long-lived assets |  | $ 132,138 | $ 26,584 | $ 31,685
[1] | Includes Corporate long-lived assets

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
Name: | us-gaap_NoncurrentAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=kfy_OtherCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |