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Pension Plans - Summary of Changes in Fair Value of Assets with Level 3 Inputs (Detail) - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	$ 169.7	$ 175.1
Realized gains on assets sold	11.1	8.2
Unrealized gains (losses) attributable to assets held	(7.5)	7.7
Net purchases and settlements	(26.0)	(21.3)
Ending balance	147.3	169.7
Hedge Funds [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	91.5	90.3
Realized gains on assets sold	3.5	0.6
Unrealized gains (losses) attributable to assets held	(2.8)	3.4
Net purchases and settlements	(6.0)	(2.8)
Ending balance	86.2	91.5
Hedge Funds [Member] | Foreign Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	18.1	24.8
Unrealized gains (losses) attributable to assets held	(0.2)	0.1
Net purchases and settlements		(6.8)
Ending balance	17.9	18.1
Private Equity Partnerships [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	47.4	49.4
Realized gains on assets sold	6.6	6.0
Unrealized gains (losses) attributable to assets held	0.2	1.1
Net purchases and settlements	(10.5)	(9.1)
Ending balance	43.7	47.4
Real estate and other real assets [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	30.8	35.4
Realized gains on assets sold	1.0	1.6
Unrealized gains (losses) attributable to assets held	(4.9)	3.2
Net purchases and settlements	(9.5)	(9.4)
Ending balance	$ 17.4	$ 30.8

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Unrealized Gains (Losses) Attributable To Assets Held

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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph c
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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