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Business Segments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 31, 2012 Segment	Jul. 31, 2011 Futurestep	Jul. 31, 2011 Executive Recruitment
Segment Reporting Information [Line Items]
Increase in operating income		$ 0.5	$ (0.5)
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

X

- Details

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