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Segments - Products and Services (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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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
Revenue from External Customer [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 revenue |  |  |  |  |  |  |  |  | 3,711.8 | 3,593.1 | 3,492.6
Tools [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,899.2 | 1,910.1 | 1,868.5
Diagnostics and Repair Information [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 748.2 | 689.6 | 689.5
Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 783.0 | $ 753.1 | $ 719.7

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