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Business Segments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2013 Segment | Jan. 31, 2012 Futurestep | Jan. 31, 2012 Futurestep | Jan. 31, 2012 Executive Recruitment | Jan. 31, 2012 Executive Recruitment
Segment Reporting Information [Line Items] |  |  |  |  |
Increase in operating income |  | $ 0.6 | $ 1.7 | $ (0.6) | $ (1.7)
Number of business segments | 3 |  |  |  |

X
- Definition Change In Business Segment Operating Income + References No definition available. + Details
Name: | kfy_ChangeInBusinessSegmentOperatingIncome
Namespace Prefix: | kfy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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