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Pension Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Normal retirement age | 65 years |  |
Accumulated benefit obligation | $ 1,385.0 | $ 1,283.1 |
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 | 7.20% | 7.40% | 7.40%
Expense recognized related to 401(k)plan | $ 8.9 | $ 8.2 | $ 7.0
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 | 3.90% |  |
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 2017 domestic pension expense and projected benefit obligation by approximately $4.3 million and $71.3 million, respectively. |  |
Discount rate assumption | 0.50% |  |
Increase in pension expense | $ 4.3 |  |
Increase in projected benefit obligation | $ 71.3 |  |
Percentage of projected benefit obligations | 83.00% |  |
Expected future employer contributions | $ 2.4 |  |
Expected long-term rate of return on plan assets | 7.45% |  |
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 | 2.70% |  |
Description of discount rate assumption | Lowering Snap-on's foreign discount rate assumption by 50 bps would have increased Snap-on's 2017 foreign pension expense and projected benefit obligation by approximately $1.8 million and $24.4 million, respectively. |  |
Discount rate assumption | 0.50% |  |
Increase in pension expense | $ 1.8 |  |
Increase in projected benefit obligation | 24.4 |  |
Expected future employer contributions | $ 9.7 |  |
Foreign Pension Plans [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term rate of return on plan assets | 1.90% |  |
Foreign Pension Plans [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term rate of return on plan assets | 6.10% |  |

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