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Weighted Average Assumptions Used for Pension Plans (Detail) | 12 Months Ended
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Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average assumptions used to determine net periodic cost, Expected return on plan assets | 8.00% |  |
Pension plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average assumptions used to determine benefit obligations, Discount rate | 4.00% | 4.25% | 4.00%
Weighted average assumptions used to determine benefit obligations, Rate of compensation increase | 3.00% | 3.00% | 4.00%
Weighted average assumptions used to determine net periodic cost, Discount rate | 4.25% | 4.00% | 4.75%
Weighted average assumptions used to determine net periodic cost, Expected return on plan assets | 8.00% | 8.00% | 8.00%
Weighted average assumptions used to determine net periodic cost, Rate of compensation increase | 3.00% | 4.00% | 4.00%
Pension plans | Benefit Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average assumptions used to determine Measurement date | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Pension plans | Net (Income) Cost |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average assumptions used to determine Measurement date | Jan. 01, 2016 | Jan. 01, 2015 | Jan. 01, 2014
Postretirement Benefit Plans | Benefit Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average assumptions used to determine benefit obligations, Discount rate | 3.66% | 3.83% | 3.50%
Weighted average assumptions used to determine benefit obligations, Measurement date | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Health care cost trend rate, Initial rate | 6.50% | 8.00% | 8.00%
Health care cost trend rate, Ultimate rate | 5.00% | 5.00% | 5.00%
Health care cost trend rate, Year trend reaches the ultimate rate | 2023 | 2022 | 2021
Postretirement Benefit Plans | Net Periodic Benefit Cost |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average assumptions used to determine net periodic cost, Discount rate | 3.83% | 3.50% | 4.31%
Health care cost trend rate, Initial rate | 8.00% | 8.00% | 8.50%
Health care cost trend rate, Ultimate rate | 5.00% | 5.00% | 5.00%
Health care cost trend rate, Year trend reaches the ultimate rate | 2022 | 2021 | 2021
Weighted average assumptions used to determine net periodic cost, Measurement date | Jan. 01, 2016 | Jan. 01, 2015 | Jan. 01, 2014

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- Definition Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Measurement Date + References No definition available. + Details
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- Definition Defined benefit plans measurement date. + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the 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=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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=65897934&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + 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=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: 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=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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=65897934&loc=d3e1928-114920 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: 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=65897934&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + 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=65897934&loc=d3e1928-114920 + Details
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