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Retirement Plans - Asset Allocations (Detail) - USD ($) $ in Millions		Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		$ 299.6	$ 271.9	$ 280.8
Equity securities, Percentage		100.00%	100.00%
Fair Value, Inputs, Level 3 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		$ 1.3	$ 1.0
Real Estate Investment [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Equity securities, Percentage		5.30%	5.30%
Real Estate Investments Valued at Net Asset Value [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	[1]	$ 15.8	$ 14.5
Equity securities [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		$ 173.4	$ 161.0
Equity securities, Percentage		57.90%	59.20%
Equity Securities Valued at Net Asset Value [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	[1]	$ 173.4	$ 161.0
Fixed income securities [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		$ 109.1	$ 95.7
Equity securities, Percentage		36.40%	35.20%
Fixed income securities [Member] | Fair Value, Inputs, Level 3 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets			$ 0.3
Fixed Income Securities Valued at Net Asset Value [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	[1]	$ 109.1	95.4
Other Investments [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		$ 1.3	$ 0.7
Equity securities, Percentage		0.40%	0.30%
Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		$ 1.3	$ 0.7
Assets Valued at Net Asset Value [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	[1]	$ 298.3	$ 270.9
[1] In accordance with ASC 820, Fair Value Measurement, certain investments are measured at fair value using the net asset value per share as a practical expedient. These assets have not been classified in the fair value hierarchy.

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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

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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

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