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Other Assets - Narrative (Details) - USD ($) $ in Millions	Dec. 29, 2019	Jun. 30, 2019	Dec. 30, 2018
Business Acquisition [Line Items]
Intangible assets, accumulated amortization	$ 10.3		$ 5.0
Advances to PersolKelly Asia Pacific	4.4
Kenzie Academy Inc.
Business Acquisition [Line Items]
Equity securities without readily determinable fair value, amount	1.0	$ 1.0
Other Assets
Business Acquisition [Line Items]
Intangible assets, accumulated amortization	$ 24.7		$ 19.6

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