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Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 28, 2019 | Dec. 29, 2018
Statement of Comprehensive Income [Abstract] |  |
Changes in unrealized holding gains and losses on available-for-sale securities. tax |  | $ 0.0
Changes in pension plans, tax |  | 0.0
Changes in value of hedged interest rate caps, tax | $ 1.7 | $ 0.5

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