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Segments - Capital Expenditures, Depreciation and Amortization (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | $ 65.6 | $ 99.4 | $ 90.9
Depreciation and amortization | 96.7 | 92.4 | 94.1
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 60.0 | 96.3 | 87.7
Depreciation and amortization | 93.1 | 88.9 | 91.0
Operating Segments | Commercial & Industrial Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 20.3 | 30.1 | 21.5
Depreciation and amortization | 25.1 | 23.5 | 23.6
Operating Segments | Snap-on Tools Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 24.2 | 42.7 | 46.0
Depreciation and amortization | 32.7 | 31.7 | 29.9
Operating Segments | Repair Systems & Information Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 14.7 | 22.7 | 19.7
Depreciation and amortization | 34.6 | 33.0 | 36.7
Operating Segments | Financial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 0.8 | 0.8 | 0.5
Depreciation and amortization | 0.7 | 0.7 | 0.8
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 5.6 | 3.1 | 3.2
Depreciation and amortization | $ 3.6 | $ 3.5 | $ 3.1

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