XML 75 R59.htm IDEA: XBRL DOCUMENT
v3.20.4

Segments - Additional Information (Detail) | 9 Months Ended
--- | ---
Jan. 31, 2021 Segment
Segment Reporting [Abstract] |
Number of line of business | 4

X
- Definition Number of line of business. + References No definition available. + Details
Name: | kfy_NumberOfLineOfBusiness
Namespace Prefix: | kfy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration