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Benefit Plans - Significant Assumptions Used (Detail) | 12 Months Ended
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Dec. 31, 2017 | Jan. 01, 2017 | Jan. 03, 2016
Net periodic pension cost for the fiscal year: |  |  |
Weighted average expected long-term rate of return on plan assets | 6.00% |  |
Primary Plan [Member] |  |  |
Projected benefit obligation at the measurement date: |  |  |
Discount rate | 3.80% | 4.44% | 4.72%
Bargaining Plan [Member] |  |  |
Projected benefit obligation at the measurement date: |  |  |
Discount rate | 3.90% | 4.49% | 4.72%
Postretirement Benefits [Member] |  |  |
Projected benefit obligation at the measurement date: |  |  |
Discount rate | 3.72% | 4.36% | 4.53%
Net periodic pension cost for the fiscal year: |  |  |
Discount rate | 4.36% | 4.53% | 4.13%
Pre Medicare [Member] |  |  |
Postretirement benefit expense - Pre-Medicare: |  |  |
Weighted average health care cost trend rate | 6.94% | 6.20% | 7.50%
Trend rate graded down to ultimate rate | 4.50% | 4.50% | 5.00%
Ultimate rate year | 2025 | 2024 | 2021
Post Medicare [Member] |  |  |
Postretirement benefit expense - Pre-Medicare: |  |  |
Weighted average health care cost trend rate | 8.07% | 7.50% | 7.00%
Trend rate graded down to ultimate rate | 4.50% | 4.50% | 5.00%
Ultimate rate year | 2025 | 2024 | 2021
Pension Plans [Member] |  |  |
Projected benefit obligation at the measurement date: |  |  |
Weighted average rate of compensation increase | 0.00% | 0.00% | 0.00%
Net periodic pension cost for the fiscal year: |  |  |
Weighted average expected long-term rate of return on plan assets | 6.00% | 6.50% | 6.50%
Weighted average rate of compensation increase | 0.00% | 0.00% | 0.00%
Pension Plans [Member] | Primary Plan [Member] |  |  |
Projected benefit obligation at the measurement date: |  |  |
Discount rate | 3.80% | 4.44% | 4.72%
Pension Plans [Member] | Bargaining Plan [Member] |  |  |
Projected benefit obligation at the measurement date: |  |  |
Discount rate | 3.90% | 4.49% | 4.72%
Pension Plans [Member] | Primary Plan and Bargaining Plan [Member] |  |  |
Net periodic pension cost for the fiscal year: |  |  |
Discount rate | 4.44% | 4.72% | 4.32%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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