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Revenue Recognition - Narrative (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Jan. 01, 2022 | Dec. 28, 2019 | Dec. 31, 2017 | Dec. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Adjustment to retained earnings | $ (4,135.8) |  | $ (4,135.8) |  |  |  | $ (3,770.5) | $ (3,772.3)
Revenue, performance obligation, description of timing |  |  | These contracts are generally for 12 months but can be for a term up to 60 months. |  |  |  |  |
Contractual obligation | 223.0 |  | $ 223.0 |  |  |  |  |
Contract with customer, liability | 63.4 |  | 63.4 |  |  |  | 49.4 |
Contract with customer, liability, revenue recognized |  |  | 34.6 |  |  |  |  |
Revenue from contracts with customers | 892.7 |  | $ 2,772.3 |  |  |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Increase in inventory obsolescence reserve |  |  |  |  |  |  | 2.4 |
Adjustment to retained earnings |  |  |  |  |  |  | $ 2.4 |
Software Subscriptions, Extended Warranties and Other Subscription Agreements |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue, performance obligation, description of timing |  |  | For performance obligations related to software subscriptions, extended warranties and other subscription agreements, Snap-on transfers control and recognizes revenue over time on a ratable basis using a time-based output method. The performance obligations are typically satisfied as services are rendered on a straight-line basis over the contract term, which is generally for 12 months but can be for a term up to 60 months. |  |  |  |  |
Ship-and-Bill Type Contracts |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue, performance obligation, description of timing |  |  | For ship-and-bill type contracts with customers, the contract states the final terms of the sale, including the description, quantity, and price of each product or service purchased. Payment terms are typically due upon delivery or up to 30 days after delivery but can range up to 120 days after delivery. |  |  |  |  |
Subscription Arrangement |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue, performance obligation, description of timing |  |  | For subscription contracts, payment terms are in advance or in arrears of services on a monthly, quarterly or annual basis over the contract term, which is generally for 12 months but can be for a term up to 60 months depending on the product or service. |  |  |  |  |
Franchise |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ 3.9 | $ 4.3 | $ 12.0 | $ 11.2 |  |  |  |
Transferred at Point in Time | Sales Revenue, Net | Ship and Bill Performance Obligations |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  | 90.00% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Capitalized contract cost, amortization period | 12 months |  | 12 months |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue, remaining performance obligation, percentage of revenue recognized |  |  |  |  | 40.00% | 50.00% |  |

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