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Acquisitions and Disposition - Pro Forma Information (Details) - Softworld, Inc. - USD ($) $ in Millions | 3 Months Ended
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Jan. 02, 2022 | Jan. 03, 2021
Business Acquisition [Line Items] |  |
Pro forma revenue | $ 4,940.9 | $ 4,626.5
Pro forma net income | $ 157.7 | $ (70.8)

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