Document And Entity Information	6 Months Ended
	Jun. 29, 2014	Jul. 27, 2014 Common Class A	Jul. 27, 2014 Common Class B
Document Information [Line Items]
Entity Registrant Name	Kelly Services Inc
Document Type	10-Q
Current Fiscal Year End Date	--12-28
Entity Common Stock, Shares Outstanding		34,130,534	3,451,161
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	Jun. 29, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2