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Segments - Products and Services (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 974.6 | $ 903.8 | $ 921.4 | $ 887.1 | $ 889.8 | $ 834.1 | $ 872.3 | $ 834.2 | $ 3,686.9 | $ 3,430.4 | $ 3,352.8
Financial services revenue | $ 79.9 | $ 79.0 | $ 77.7 | $ 76.8 | $ 74.2 | $ 71.6 | $ 69.3 | $ 66.3 | 313.4 | 281.4 | 240.3
Total revenue |  |  |  |  |  |  |  |  | 4,000.3 | 3,711.8 | 3,593.1
Tools [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,946.7 | 1,899.2 | 1,910.1
Diagnostics Information and Management [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 800.4 | 748.2 | 689.6
Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 939.8 | $ 783.0 | $ 753.1

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