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Subsequent Events - Additional Information (Detail) (Subsequent Event, USD $)	0 Months Ended
	Dec. 08, 2014	Dec. 08, 2014
Subsequent Event
Subsequent Event [Line Items]
Dividend policy adoption date	Dec. 08, 2014
Regular quarterly cash dividend	$ 0.10
Increase in stock repurchase program	$ 125,641,342.53
Stock repurchase program, aggregate amount		$ 150,000,000

X

- Definition

Date the dividend policy was adopted by the Board, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	kfy_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Increase In Stock Repurchase Program Authorized Amount

+ References

No definition available.

+ Details

Name:	kfy_IncreaseInStockRepurchaseProgramAuthorizedAmount
Namespace Prefix:	kfy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of cash dividend per share that is expected to be declared quarterly.

+ References

No definition available.

+ Details

Name:	kfy_QuarterlyCashDividendPerShare
Namespace Prefix:	kfy_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Data Type:	xbrli:stringItemType
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