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Receivables - Narrative (Detail) $ in Millions | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 26, 2020 USD ($) portfolioSegment | Jun. 27, 2020 USD ($) | Dec. 28, 2019 USD ($) | Sep. 28, 2019 USD ($) | Jun. 29, 2019 USD ($) | Dec. 29, 2018 USD ($)
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Increase in allowance for credit losses |  |  | $ 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 |  |  |  |  |
Number of portfolio segments | portfolioSegment | 2 |  |  |  |  |
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 |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Increase in allowance for credit losses |  |  | 8.1 |  |  |
Finance Receivables |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Increase in allowance for credit losses | $ 75.0 | $ 72.5 | 61.9 | $ 61.1 | $ 60.9 | $ 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 |  |  |  |  |
Contract Receivables |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Increase in allowance for credit losses | $ 9.0 | $ 9.1 | $ 5.6 | $ 6.0 | $ 5.0 | $ 4.3
Contract Receivables | Non-Franchisee |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Financing receivable, threshold period past due, writeoff (in days) | 150 days |  |  |  |  |
Contract Receivables | Franchisee |  |  |  |  |  |
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 |  |  |  |  |

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