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Segments - Assets by Segment (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Jan. 02, 2016
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 4,723.2 | $ 4,331.1
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 4,575.9 | 4,162.3
Operating Segments [Member] | Commercial & Industrial Group [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 907.1 | 901.6
Operating Segments [Member] | Snap-on Tools Group [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 668.1 | 646.7
Operating Segments [Member] | Repair Systems & Information Group [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,211.0 | 1,041.6
Operating Segments [Member] | Financial Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,789.7 | 1,572.4
Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 212.3 | 203.6
Intersegment Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | $ (65.0) | $ (34.8)

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