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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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- 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 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) 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 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 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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