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Inventories (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018
Inventory [Line Items] |  |
Roasted Coffee Inventory | $ 276.4 | $ 281.2
Price-to-be-fixed Contract [Member] |  |
Inventory [Line Items] |  |
Amount of coffee committed to be purchased | 248.8 |
Fixed-price Contract [Member] |  |
Inventory [Line Items] |  |
Amount of coffee committed to be purchased | 925.7 |
Coffee Contracts [Member] |  |
Inventory [Line Items] |  |
Price-to-be-fixed contracts fixed through use of futures contracts | 2.0 | $ 0.0
Designated as Hedging Instrument [Member] |  |
Inventory [Line Items] |  |
Derivative Assets | $ 1.9 |

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