Retirement and Other Employee Benefits - Amounts of AOCI Expected to be Amortized as a Component of Net Period Cost (Detail) $ in Millions	Dec. 27, 2019 USD ($)
Pension plans \| United States
Defined Benefit Plan Disclosure [Line Items]
2020 amortization of net losses	$ 0.4
Pension plans \| United Kingdom
Defined Benefit Plan Disclosure [Line Items]
2020 amortization of net losses	0.0
Post-retirement plans \| Central America
Defined Benefit Plan Disclosure [Line Items]
2020 amortization of net losses	$ 0.1

Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (s)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanExpectedAmortizationNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant