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Investment in Persol Holdings	12 Months Ended
Investment in Persol Holdings	Jan. 03, 2021
Investment in Persol Holdings [Abstract]
Investment in Persol Holdings	Investment in Persol Holdings The Company has a yen-denominated investment through the Company's subsidiary, Kelly Services Japan, Inc., in the common stock of Persol Holdings Co., Ltd. ("Persol Holdings"), the 100% owner of Persol Asia Pacific Pte. Ltd., the Company's joint venture partner in PersolKelly Pte. Ltd. ("the JV"). As our investment is a noncontrolling interest in Persol Holdings, this investment is recorded at fair value based on the quoted market price of Persol Holdings stock on the Tokyo Stock Exchange as of the period end (see Fair Value Measurements footnote). The Company adopted ASU 2016-01 and as a result, effective January 1, 2018, all changes in fair value on the investment are recognized in net earnings which previously were recorded in other comprehensive income. A cumulative catch-up adjustment of the prior net unrealized gains previously recorded in other comprehensive income, and in accumulated other comprehensive income (loss), a component of stockholders’ equity, was recorded in earnings invested in the business as of January 1, 2018 for $140.0 million, net of $69.9 million of taxes. A loss on the investment of $16.6 million, a gain on the investment of $35.8 million, and a loss on the investment of $96.2 million for the years ended 2020, 2019, and 2018, respectively, was recorded entirely in gain (loss) on investment in Persol Holdings in the consolidated statements of earnings.