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Segments - Products and Services (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
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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+ References

No definition available.

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The aggregate financial services revenue and operating interest income earned during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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