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Retirement Plans - Asset Allocations (Detail) - USD ($) $ in Millions | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets |  | $ 254.4 | $ 299.6 | $ 271.9
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  | 100.00% | 100.00% |
Equity securities [Member] |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  | 54.40% | 57.90% |
Equity securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [1] | $ 138.2 | $ 173.4 |
Fixed income securities [Member] |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  | 38.50% | 36.40% |
Fixed income securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [1] | $ 98.0 | $ 109.1 |
Real Estate Investment [Member] |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  | 6.30% | 5.30% |
Real Estate Investment [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [1] | $ 16.1 | $ 15.8 |
Other Investments [Member] |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  | 0.80% | 0.40% |
Other Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [2] | $ 2.1 | $ 1.3 |
[1] | In accordance with ASC 820, Fair Value Measurement (“ASC 820”), 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.
[2] | In accordance with ASC 820, investments have been measured using valuation techniques in which one or more significant inputs are unobservable (Level 3). See Note 15 for additional information.

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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