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Debt (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013
Short-term Debt [Line Items]
Short-term borrowings	$ 91.9us-gaap_ShortTermBorrowings	$ 28.3us-gaap_ShortTermBorrowings
The Facility | Revolving Line of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	200.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = kelya_TheFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LineOfCreditMember
Short-term borrowings	0.4us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = kelya_TheFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LineOfCreditMember	0us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = kelya_TheFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LineOfCreditMember
Remaining borrowing capacity	199.6us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = kelya_TheFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LineOfCreditMember	200.0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = kelya_TheFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LineOfCreditMember
Commitment fee percentage (in basis points)	0.25%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = kelya_TheFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LineOfCreditMember	0.25%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = kelya_TheFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LineOfCreditMember
Interest rate	3.75%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = kelya_TheFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LineOfCreditMember
Securitization Facility
Short-term Debt [Line Items]
Maximum borrowing capacity	150.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = kelya_SecuritizationFacilityMember
Short-term borrowings	88.0us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = kelya_SecuritizationFacilityMember	28.0us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = kelya_SecuritizationFacilityMember
Remaining borrowing capacity	7.5us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = kelya_SecuritizationFacilityMember	67.0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = kelya_SecuritizationFacilityMember
Interest rate	0.57%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = kelya_SecuritizationFacilityMember	0.57%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = kelya_SecuritizationFacilityMember
Securitization Facility | Standby Letter of Credit Related to Workers' Compensation
Short-term Debt [Line Items]
Interest rate	0.40%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = kelya_StandbyLetterOfCreditRelatedToWorkersCompensationMember / us-gaap_DebtInstrumentAxis = kelya_SecuritizationFacilityMember	0.40%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = kelya_StandbyLetterOfCreditRelatedToWorkersCompensationMember / us-gaap_DebtInstrumentAxis = kelya_SecuritizationFacilityMember
Letters of credit outstanding	54.5us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = kelya_StandbyLetterOfCreditRelatedToWorkersCompensationMember / us-gaap_DebtInstrumentAxis = kelya_SecuritizationFacilityMember	55.0us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = kelya_StandbyLetterOfCreditRelatedToWorkersCompensationMember / us-gaap_DebtInstrumentAxis = kelya_SecuritizationFacilityMember
Unsecured Uncommitted Short-term Local Credit Facilities
Short-term Debt [Line Items]
Maximum borrowing capacity	15.5us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = kelya_UnsecureduncommittedshorttermlocalcreditfacilitiesMember
Short-term borrowings	$ 3.5us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = kelya_UnsecureduncommittedshorttermlocalcreditfacilitiesMember	$ 0.3us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = kelya_UnsecureduncommittedshorttermlocalcreditfacilitiesMember
Interest rate	2.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = kelya_UnsecureduncommittedshorttermlocalcreditfacilitiesMember	10.75%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = kelya_UnsecureduncommittedshorttermlocalcreditfacilitiesMember
Facility Fee | Securitization Facility
Short-term Debt [Line Items]
Commitment fee percentage (in basis points)	0.40%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = kelya_SecuritizationFacilityMember / us-gaap_NatureOfExpenseAxis = kelya_FacilityFeeMember

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

The effective interest rate at the end of the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 19, 22

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X

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a),16(a)(1))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 13

-Subparagraph 2, 3

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+ Details

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- Details

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- Details

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- Details

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- Details

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