XML 72 R61.htm IDEA: XBRL DOCUMENT
v3.20.2

Inventories - Narrative (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019 | Dec. 28, 2019
Geographic Valuation Methodologies Of Inventory [Line Items] |  |  |  |  |
Percentage of FIFO Inventory | 56.00% |  | 56.00% |  | 58.00%
Effect of LIFO inventory liquidation on income | $ 0 | $ 0 | $ 0 | $ 0 |
United States |  |  |  |  |
Geographic Valuation Methodologies Of Inventory [Line Items] |  |  |  |  |
Percentage of FIFO Inventory | 29.00% |  | 29.00% |  |
Percentage of LIFO Inventory | 71.00% |  | 71.00% |  |

X
- Definition Geographic Valuation Methodologies of Inventory [Line Items] + References No definition available. + Details
Name: | sna_GeographicValuationMethodologiesOfInventoryLineItems
Namespace Prefix: | sna_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The effect of liquidating LIFO (last in first out) inventory layers on income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SAB Topic 11.F) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100079-122729 + Details
Name: | us-gaap_EffectOfLIFOInventoryLiquidationOnIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage of FIFO (first in first out) inventory to total inventory as of the balance sheet date if other than 100 percent. + References No definition available. + Details
Name: | us-gaap_PercentageOfFIFOInventory
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent. + References No definition available. + Details
Name: | us-gaap_PercentageOfLIFOInventory
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |