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Postretirement Plans - Summary of Target Allocation and Weighted-Average Asset Allocation by Asset Category and Fair Value of Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,110.8	$ 1,049.2	$ 1,103.4
Voluntary Employees Beneficiary Association Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation	100.00%
Actual weighted-average asset allocation	100.00%	100.00%
Fair value of plan assets	$ 13.2	$ 13.7
Voluntary Employees Beneficiary Association Plan Assets [Member] | Debt Securities and Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation	46.00%
Actual weighted-average asset allocation	45.00%	44.00%
Voluntary Employees Beneficiary Association Plan Assets [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation	29.00%
Actual weighted-average asset allocation	28.00%	27.00%
Fair value of plan assets	$ 3.6	$ 3.7
Voluntary Employees Beneficiary Association Plan Assets [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation	25.00%
Actual weighted-average asset allocation	27.00%	29.00%
Fair value of plan assets	$ 3.6	$ 3.9

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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

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ 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)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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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

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-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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