Inventories (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 29, 2020	Sep. 27, 2020
Inventory [Line Items]
Inventory Write-down	$ 50.0
Fixed-price Contract [Member]
Inventory [Line Items]
Amount of coffee committed to be purchased		$ 687.0
Price-to-be-fixed Contract [Member]
Inventory [Line Items]
Amount of coffee committed to be purchased		$ 458.0