Receivables - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Dec. 29, 2019	Dec. 28, 2019	Dec. 29, 2018
Financing Receivable, Past Due [Line Items]
Financing receivable allowance for credit loss			$ 75.6	$ 67.5
Minimum payment term for trade and other accounts receivable (in days)	30 days
Maximum payment term for trade and other accounts receivable (in days)	120 days
Average payment term for finance receivables (in years)	4 years
Maximum payment term for contract receivables (in years)	10 years
Minimum period past due to consider receivable balances as delinquent (in days)	30 days
Minimum period past due to declare receivable as non-accrual status (in days)	90 days
ASU 2016-13
Financing Receivable, Past Due [Line Items]
Financing receivable allowance for credit loss			$ 8.1
Finance Receivables
Financing Receivable, Past Due [Line Items]
Financing receivable allowance for credit loss	$ 69.2	$ 61.0		61.9	$ 61.4
Financing receivable, threshold period past due, writeoff (in days)	120 days
Financing receivable, threshold period after asset repossession, writeoff (in days)	60 days
Provision for credit losses	$ 16.3	12.5
Finance Receivables | COVID-19 Pandemic
Financing Receivable, Past Due [Line Items]
Provision for credit losses	2.1
Contract Receivables
Financing Receivable, Past Due [Line Items]
Financing receivable allowance for credit loss	8.6	4.7		$ 5.6	$ 4.3
Provision for credit losses	1.4	$ 0.9
Contract Receivables | COVID-19 Pandemic
Financing Receivable, Past Due [Line Items]
Provision for credit losses	$ 0.5
Contract Receivables | Non-Franchisee [Member]
Financing Receivable, Past Due [Line Items]
Financing receivable, threshold period past due, writeoff (in days)	150 days
Contract Receivables | Franchisee [Member]
Financing Receivable, Past Due [Line Items]
Financing receivable, threshold period past due, writeoff (in days)	180 days
Financing Receivables And Contract Receivables, Customer Bankruptcy
Financing Receivable, Past Due [Line Items]
Financing receivable, threshold period past due, writeoff (in days)	180 days