Document And Entity Information (USD $)	12 Months Ended
	Dec. 30, 2012	Jul. 01, 2012	Feb. 03, 2013 Common Class A [Member]	Feb. 03, 2013 Common Class B [Member]
Entity Registrant Name	Kelly Services Inc
Document Type	10-K
Current Fiscal Year End Date	--12-30
Entity Common Stock, Shares Outstanding			33,723,170	3,452,585
Entity Public Float		$ 373,723,242
Amendment Flag	false
Entity Central Index Key	0000055135
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY