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Segments - Net Sales by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Oct. 03, 2015 | Jul. 04, 2015 | Apr. 04, 2015 | Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 889.8 | $ 834.1 | $ 872.3 | $ 834.2 | $ 851.7 | $ 821.5 | $ 851.8 | $ 827.8 | $ 3,430.4 | $ 3,352.8 | $ 3,277.7
Financial services revenue | $ 74.2 | $ 71.6 | $ 69.3 | $ 66.3 | $ 63.1 | $ 61.1 | $ 58.7 | $ 57.4 | 281.4 | 240.3 | 214.9
Total revenues |  |  |  |  |  |  |  |  | 3,711.8 | 3,593.1 | 3,492.6
Operating earnings |  |  |  |  |  |  |  |  | 854.2 | 764.8 | 684.7
Interest expense |  |  |  |  |  |  |  |  | (52.2) | (51.9) | (52.9)
Other income (expense) - net |  |  |  |  |  |  |  |  | (0.6) | (2.4) | (0.9)
Earnings before income taxes and equity earnings |  |  |  |  |  |  |  |  | 801.4 | 710.5 | 630.9
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,962.1 | 3,845.5 | 3,725.2
Operating earnings |  |  |  |  |  |  |  |  | 945.6 | 869.0 | 782.0
Operating Segments [Member] | Commercial & Industrial Group [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,148.3 | 1,163.6 | 1,174.8
Operating earnings |  |  |  |  |  |  |  |  | 168.0 | 169.4 | 158.6
Operating Segments [Member] | Snap-on Tools Group [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,633.9 | 1,568.7 | 1,455.2
Operating earnings |  |  |  |  |  |  |  |  | 281.1 | 256.0 | 223.1
Operating Segments [Member] | Repair Systems & Information Group [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,179.9 | 1,113.2 | 1,095.2
Operating earnings |  |  |  |  |  |  |  |  | 297.8 | 273.4 | 251.2
Operating Segments [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating earnings |  |  |  |  |  |  |  |  | 198.7 | 170.2 | 149.1
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (531.7) | (492.7) | (447.5)
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating earnings |  |  |  |  |  |  |  |  | $ (91.4) | $ (104.2) | $ (97.3)

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