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Changes In Restructuring Liability (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Jan. 31, 2015	Jan. 31, 2015	Jan. 31, 2014
Restructuring Cost and Reserve [Line Items]
Liability, Beginning period	$ 4,185us-gaap_RestructuringReserve	$ 2,813us-gaap_RestructuringReserve
Restructuring charges (recoveries), net	(418)kfy_RestructuringIncomeExpenseNet	9,468kfy_RestructuringIncomeExpenseNet	3,682kfy_RestructuringIncomeExpenseNet
Reductions for cash payments	(1,753)us-gaap_PaymentsForRestructuring	(9,932)us-gaap_PaymentsForRestructuring
Exchange rate fluctuations	(243)us-gaap_RestructuringReserveTranslationAdjustment	(578)us-gaap_RestructuringReserveTranslationAdjustment
Liability, Ending period	1,771us-gaap_RestructuringReserve	1,771us-gaap_RestructuringReserve
Severance
Restructuring Cost and Reserve [Line Items]
Liability, Beginning period	2,445us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Restructuring charges (recoveries), net	(347)kfy_RestructuringIncomeExpenseNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	9,224kfy_RestructuringIncomeExpenseNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Reductions for cash payments	(1,288)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	(8,123)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Exchange rate fluctuations	(170)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	(461)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Liability, Ending period	640us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	640us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Facilities
Restructuring Cost and Reserve [Line Items]
Liability, Beginning period	1,740us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	2,813us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Restructuring charges (recoveries), net	(71)kfy_RestructuringIncomeExpenseNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	244kfy_RestructuringIncomeExpenseNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Reductions for cash payments	(465)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(1,809)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Exchange rate fluctuations	(73)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	(117)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Liability, Ending period	$ 1,131us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	$ 1,131us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember

X

- Definition

Amount of expenses (income) associated with exit or disposal activities pursuant to an authorized plan.

+ References

No definition available.

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X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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X

- Definition

Amount of foreign currency translation adjustment increasing or decreasing the accrual for a specified type of restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b)(2))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)(2)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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