Allowance for Credit Losses - Advances to Growers Along with the Related Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	Sep. 25, 2020	Dec. 27, 2019	Sep. 27, 2019	Dec. 28, 2018
Past-Due
Accounts Receivable, Allowance for Credit Loss	$ 10.1	$ 8.9
Accounting Standards Update 2016-13 [Member]
Past-Due
Accounts Receivable, Allowance for Credit Loss		1.0
Advances to Growers
Current Status
Gross advances to growers and suppliers	34.0	33.8
Past-Due
Gross advances to growers and suppliers	4.8	8.3
Financing Receivable, Allowance for Credit Loss	$ 2.1	2.3	$ 2.8	$ 2.8
Advances to Growers | Accounting Standards Update 2016-13 [Member]
Past-Due
Financing Receivable, Allowance for Credit Loss		$ 0.2