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Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2022 | Jun. 30, 2022 | Dec. 30, 2023 | Sep. 30, 2023
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired / measurement period adjustments |  |  | $ 162.7 |
Poppin |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  |  | $ 2.7
Poppin | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Inventories, net |  |  |  | 9.7
Prepaid expenses and other current assets |  |  |  | 3.1
Accounts payable and accrued expenses |  |  |  | 7.0
Current lease obligations - Operating |  |  |  | $ 3.0
Lamex | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Consideration | $ 75.0 |  |  |
Gain on sale | 50.4 |  |  |
Transaction-related expenses | 6.0 |  |  |
Foreign currency translation benefit | $ 3.3 |  |  |
Dickerson Heart Products |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments for asset acquisitions |  | $ 8.0 |  |
Goodwill acquired / measurement period adjustments |  | $ 7.6 |  |
Workplace Furnishings |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired / measurement period adjustments |  |  | 162.7 |
Kimball International, Inc |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Transaction expenses |  |  | 41.2 |
Kimball International, Inc | Long-Term Debt |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Transaction costs |  |  | 2.8 |
Kimball International, Inc | Other Noncurrent Assets |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Transaction costs |  |  | 0.2 |
Kimball International, Inc | Additional Paid-in Capital |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Transaction costs |  |  | 0.3 |
Kimball International, Inc | General Corporate |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Transaction expenses |  |  | 28.6 |
Kimball International, Inc | Workplace Furnishings |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Transaction expenses |  |  | $ 12.5 |

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