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Pension Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Normal retirement age | 65 years |  |
Accumulated benefit obligation | $ 1,283.1 | $ 1,231.2 |
Description of amortization actuarial gains and losses | Actuarial gains and losses in excess of 10 percent of the greater of the projected benefit obligation or market-related value of assets are amortized on a straight-line basis over the average remaining service period of active participants or over the average remaining life expectancy for plans with primarily inactive participants. |  |
Expected long-term rate of return on plan assets | 7.40% | 7.40% | 7.40%
Expense recognized related to 401(k)plan | $ 8.2 | $ 7.0 | $ 6.5
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Time horizon for asset under risk and correlation assumption (in years) | 10 years |  |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Time horizon for asset under risk and correlation assumption (in years) | 20 years |  |
Domestic Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted-average discount rate | 4.50% |  |
Description of discount rate assumption | Lowering Snap-on'sdomestic discount rate assumption by 50 basis points (100 basis points ("bps") equals 1.0 percent) would have increased Snap-on's 2016 domestic pension expense and projected benefit obligation by approximately $6.7 million and $65.3 million, respectively. |  |
Discount rate assumption | 0.50% |  |
Increase in pension expense | $ 6.7 |  |
Increase in projected benefit obligation | $ 65.3 |  |
Percentage of projected benefit obligations | 83.00% |  |
Expected future employer contributions | $ 2.3 |  |
Expected long-term rate of return on plan assets | 7.50% |  |
Pension plans' assets as percentage of worldwide pension assets | 86.00% |  |
Foreign Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted-average discount rate | 2.90% |  |
Description of discount rate assumption | Lowering Snap-on's foreign discount rate assumption by 50 bps would have increased Snap-on's 2016 foreign pension expense and projected benefit obligation by approximately $1.7 million and $23.4 million, respectively. |  |
Discount rate assumption | 0.50% |  |
Increase in pension expense | $ 1.7 |  |
Increase in projected benefit obligation | 23.4 |  |
Expected future employer contributions | $ 7.1 |  |
Foreign Pension Plans [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term rate of return on plan assets | 1.80% |  |
Foreign Pension Plans [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term rate of return on plan assets | 6.30% |  |

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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