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Retirement Plans - Asset Allocations (Detail) - USD ($) $ in Millions | Jan. 02, 2016 | Jan. 03, 2015 | Dec. 28, 2013
--- | --- | --- | ---
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 280.8 | $ 302.1 | $ 319.6
Equity securities, Percentage | 100.00% | 100.00% |
Level 1 [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets |  | $ 0.0 |
Level 2 [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 269.0 | 301.5 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 11.8 | 0.6 |
Equity securities [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 169.8 | $ 195.6 |
Equity securities, Percentage | 60.50% | 64.70% |
Equity securities [Member] | Level 1 [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets |  | $ 0.0 |
Equity securities [Member] | Level 2 [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 169.8 | 195.6 |
Equity securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Fixed income securities [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 99.5 | $ 106.2 |
Equity securities, Percentage | 35.40% | 35.20% |
Fixed income securities [Member] | Level 1 [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets |  | $ 0.0 |
Fixed income securities [Member] | Level 2 [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 99.2 | 105.9 |
Fixed income securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0.3 | 0.3 |
Other Investments [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 11.5 | $ 0.3 |
Equity securities, Percentage | 4.10% | 0.10% |
Other Investments [Member] | Level 1 [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets |  | $ 0.0 |
Other Investments [Member] | Level 2 [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 0.0 | 0.0 |
Other Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 11.5 | $ 0.3 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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