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Summary of Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011
Summary Of Accounting Policies [Line Items] |  |  |  |
Investments in unconsolidated affiliates | $ 13.3 us-gaap_EquityMethodInvestments | $ 14.2 us-gaap_EquityMethodInvestments |  |
Note receivable due from sold equity investment |  |  | 32.0 sna_NoteReceivableDueFromSoldEquityInvestment |
Unconsolidated affiliate, including of cash |  |  | 27.0 sna_CashReceivedFromUnconsolidatedAffiliates |
Equity investment dividends | 0 us-gaap_EquityMethodInvestmentDividendsOrDistributions | 0 us-gaap_EquityMethodInvestmentDividendsOrDistributions | 0 us-gaap_EquityMethodInvestmentDividendsOrDistributions |
Purchases from unconsolidated affiliates | 15.6 sna_PurchaseFromAffiliate | 16.0 sna_PurchaseFromAffiliate | 15.2 sna_PurchaseFromAffiliate |
Franchise fee | 12.1 us-gaap_FranchiseRevenue | 11.9 us-gaap_FranchiseRevenue | 9.9 us-gaap_FranchiseRevenue |
Research and engineering costs | 52.4 us-gaap_ResearchAndDevelopmentExpense | 48.4 us-gaap_ResearchAndDevelopmentExpense | 44.8 us-gaap_ResearchAndDevelopmentExpense |
Capitalized software development costs | 19.0 us-gaap_CapitalizedComputerSoftwareAdditions | 19.0 us-gaap_CapitalizedComputerSoftwareAdditions | 23.0 us-gaap_CapitalizedComputerSoftwareAdditions |
Amortization of capitalized software development costs | 13.6 us-gaap_CapitalizedComputerSoftwareAmortization | 14.9 us-gaap_CapitalizedComputerSoftwareAmortization | 14.3 us-gaap_CapitalizedComputerSoftwareAmortization |
Unamortized capitalized software development costs | 50.2 us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers | 45.1 us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers |  |
Shipping and handling charges related to manufacturing activities | 40.3 sna_ShippingAndHandlingChargesRelatedToManufacturingActivities | 37.9 sna_ShippingAndHandlingChargesRelatedToManufacturingActivities | 37.1 sna_ShippingAndHandlingChargesRelatedToManufacturingActivities |
Shipping and handling charges | 78.5 us-gaap_ShippingHandlingAndTransportationCosts | 72.7 us-gaap_ShippingHandlingAndTransportationCosts | 65.4 us-gaap_ShippingHandlingAndTransportationCosts |
Advertising and promotion expenses | 51.4 us-gaap_MarketingAndAdvertisingExpense | 49.9 us-gaap_MarketingAndAdvertisingExpense | 50.1 us-gaap_MarketingAndAdvertisingExpense |
Foreign exchange loss | 1.5 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | 4.4 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | 0.7 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |
Dilutive shares | 921,050 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 881,381 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 669,503 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |
Options to purchase common stock not included in the computation of diluted earnings per share |  |  | 296,643 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
Cash and cash equivalents | 132.9 us-gaap_CashAndCashEquivalentsAtCarryingValue | 217.6 us-gaap_CashAndCashEquivalentsAtCarryingValue | 214.5 us-gaap_CashAndCashEquivalentsAtCarryingValue | 185.6 us-gaap_CashAndCashEquivalentsAtCarryingValue
Contractual Maturity One To Five Years [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Note receivable due from sold equity investment |  |  | 5.0 sna_NoteReceivableDueFromSoldEquityInvestment / us-gaap_InvestmentTypeAxis = sna_ContractualMaturityOneToFiveYearsMember |
Money Market Funds [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 2.5 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember | $ 91.6 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember |  |
Finance Receivables [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Days past due, finance receivables assessed for charge-off | 120 days |  |  |
Contract Receivables Related To Equipment Leases [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Days past due, receivables charged-off | 150 days |  |  |
Minimum [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest under equity method accounting | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Revenue recognition, length, in months | 12 months |  |  |
Maximum [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest under equity method accounting | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Revenue recognition, length, in months | 60 months |  |  |
Days, past due, customer bankruptcies charged-off for finance and contract receivables | 180 days |  |  |
Maximum [Member] | Finance Receivables [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Days past due, receivables charged-off | 60 days |  |  |
Maximum [Member] | Contract Receivables Related To Franchise Finance [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Days past due, receivables charged-off | 180 days |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Unamortized costs incurred for development of computer software, which is to be sold, leased or otherwise marketed, after establishing technological feasibility through to the general release of the software products. Excludes capitalized costs of developing software for internal use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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