Commitments and Contingencies (Detail) $ in Millions			3 Months Ended			12 Months Ended			24 Months Ended
	Mar. 14, 2019 USD ($)	Sep. 25, 2003 USD ($)	Dec. 27, 2019 USD ($)	Sep. 27, 2002 USD ($)	Sep. 28, 2001 USD ($)	Dec. 27, 2019 USD ($)	Dec. 28, 2018 USD ($)	Dec. 29, 2017 USD ($)	Dec. 28, 2018 vessel	Dec. 31, 1980 subsidiary
Commitments and Contingencies Disclosure [Line Items]
Total purchases under agreements to purchase certain products of our independent growers						$ 691.8	$ 763.9	$ 815.0
Kunia Well Site cleanup operation, accrual expected to be paid in the second year			$ 1.1			1.1
Kunia Well Site cleanup operation, accrual expected to be paid in the third year			0.9			0.9
Kunia Well Site cleanup operation, accrual expected to be paid in the fourth year			0.9			0.9
Award from litigation settlement	$ 17.0
Gain on litigation settlement	16.0
Litigation expense	$ 1.0
Capital Addition Purchase Commitments
Commitments and Contingencies Disclosure [Line Items]
Number of refrigerated container ships | vessel									6
Purchase commitment amount							126.5
Payments due in 2020			85.2			85.2
Payments due in 2021			41.3			41.3
Mann Packing | Net sales
Commitments and Contingencies Disclosure [Line Items]
Customer claims and other charges from recalled vegetable products			6.0
Mann Packing | Cost of sales
Commitments and Contingencies Disclosure [Line Items]
Customer claims and other charges from recalled vegetable products			4.4
Kunia Well Site
Commitments and Contingencies Disclosure [Line Items]
Number of subsidiaries involved in litigation | subsidiary										1
Kunia Well Site cleanup operation, charge for estimated expected future cleanup cost				$ 7.0	$ 15.0
Kunia Well Site cleanup operation, estimated remediation costs associated with the cleanup				$ 26.1	$ 19.1
Accrual for environmental loss contingencies, estimated payment period		10 years
Kunia Well Site cleanup operation, undiscounted estimated remediation costs associated with the cleanup								13.3
Kunia Well Site cleanup operation, accrual expected to be paid in the next 12 months			0.4			0.4
Kunia Well Site cleanup operation, accrual expected to be paid in the fifth year			$ 0.9			$ 0.9
Kunia Well Site | Minimum
Commitments and Contingencies Disclosure [Line Items]
Kunia Well Site cleanup operation, estimated remediation costs associated with the cleanup		$ 12.9
Kunia Well Site cleanup operation, undiscounted estimated remediation costs associated with the cleanup								13.3
Kunia Well Site | Maximum
Commitments and Contingencies Disclosure [Line Items]
Kunia Well Site cleanup operation, estimated remediation costs associated with the cleanup		$ 25.4
Kunia Well Site cleanup operation, undiscounted estimated remediation costs associated with the cleanup								28.7
Discount Rate Adjustment | Fresh and value-added products
Commitments and Contingencies Disclosure [Line Items]
Other increase (decrease) in environmental liabilities							$ 0.4
Other non-current liabilities | Kunia Well Site
Commitments and Contingencies Disclosure [Line Items]
Kunia Well Site cleanup operation, undiscounted estimated remediation costs associated with the cleanup								13.0
Accounts payable and accrued expenses current | Kunia Well Site
Commitments and Contingencies Disclosure [Line Items]
Kunia Well Site cleanup operation, undiscounted estimated remediation costs associated with the cleanup								$ 0.3