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Fair Value Measurements - Roll Forward (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 27, 2021 | Mar. 28, 2020 | Mar. 27, 2021 | Mar. 28, 2020
Fair Value Disclosures [Abstract] |  |  |  |
Beginning balance | $ 86.4 | $ 10.0 | $ 81.8 | $ 9.1
Contingent consideration recorded at acquisition | 0.0 | 0.9 | 0.0 | 0.9
Fair value adjustments | (14.7) | (0.5) | (10.1) | 0.4
Payments/Accruals | 0.0 | (9.6) | 0.0 | (9.6)
Ending balance | $ 71.7 | $ 0.8 | $ 71.7 | $ 0.8

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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