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Related Party Transactions	12 Months Ended
Related Party Transactions	Jan. 02, 2022
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Terence E. Adderley Revocable Trust K (“Trust K”), which became irrevocable upon the death of Terence E. Adderley (the former Chairman of the Company's board of directors) on October 9, 2018, controls approximately 91.6% of the outstanding shares of Kelly Class B common stock. There were no material transactions between the Company and Trust K or its trustees in 2021, 2020 or 2019. See Investment in PersolKelly Pte. Ltd. footnote for a description of related party activity with PersolKelly Pte. Ltd.