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Postretirement Plans - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
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Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Sep. 30, 2014 Employee | Jan. 02, 2016 USD ($) | Jan. 03, 2015 USD ($) shares | Dec. 28, 2013 USD ($)
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Number of former employees covered | Employee |  |  | 2,500 |  |  |
Percentage reduced in plan obligations |  |  | 10.00% |  |  |
Settlement loss |  |  |  |  | $ 15,387,000 |
Expected pension income for fiscal 2016 |  |  |  | $ 6,200,000 |  |
Expected long-term rate of return on plan assets |  |  |  | 8.00% |  |
Percentage of total plan assets |  |  |  | 100.00% | 100.00% |
Proceeds from shares sold on open market by the plan |  |  |  |  | $ 19,100,000 |
Expected company contribution |  |  |  | $ 730,000 |  |
Postretirement Benefits, minimum years of service for eligibility |  |  |  | 10 years |  |
Postretirement Benefits, minimum age for eligibility |  |  |  | 55 years |  |
Contributions by participants |  |  |  | $ 224,000 | 192,000 | $ 400,000
Expense under plans |  |  |  | (5,878,000) | 5,341,000 | (2,041,000)
Total cost and employer contributions |  |  |  | $ 26,500,000 | $ 26,200,000 | $ 23,000,000
Minimum |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Retiree medical coverage provided |  |  |  | 3 years |  |
Percentage of funded under multi employer plans |  |  |  | 0.00% |  |
Maximum |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Retiree medical coverage provided |  |  |  | 5 years |  |
Contribution of pension fund in excess of total contribution |  |  |  | 5.00% | 5.00% | 5.00%
Common Stock |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan equity securities included in common stock | shares | 2,030,363 | 2,030,363 |  |  |  |
Equity securities, amount | $ 43,600,000 | $ 39,000,000 |  |  |  |
Percentage of total plan assets | 11.80% | 10.20% |  |  |  |
Number of shares sold on open market by the plan | shares |  |  |  |  | 1,000,000 |
Lump Sums Plan No. 1 |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Distributions from existing plan assets | $ 48,400,000 | $ 50,400,000 |  |  |  |
Plan No. 1 |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Settlement loss |  | $ 15,400,000 |  |  |  |
Plan No. 2 |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Settlement loss |  |  |  |  | $ 0 |
Lump Sums Plan No. 2 |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Distributions from existing plan assets | $ 2,000,000 |  |  |  | 2,000,000 |
Pension plans |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Distributions from existing plan assets |  |  |  | $ 25,014,000 | 27,046,000 | $ 25,494,000
Settlement loss |  |  |  |  | 15,387,000 |
Actual return on plan assets |  |  |  | 6,881,000 | $ 11,613,000 | $ 73,200,000
Amortization from accumulated other comprehensive income into net periodic cost (benefit) |  |  |  | $ 6,200,000 |  |
Expected long-term rate of return on plan assets |  |  |  | 8.00% | 8.00% | 8.00%
Contribution of company to company pension plans |  |  |  | $ 10,436,000 | $ 13,435,000 | $ 15,254,000
Pension plans | Required |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  | 436,000 | 5,070,000 | 5,416,000
Pension plans | Discretionary |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  | $ 10,000,000 | 8,365,000 | 9,838,000
Last Fifteen Years |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Average annual return on the plan assets |  |  |  | 6.90% |  |
Inception in 1987 |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Average annual return on the plan assets |  |  |  | 9.10% |  |
Non Qualified Pension Plans |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Expected company contribution |  |  |  | $ 400,000 |  |
Non Qualified Pension Plans | Required |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  | 400,000 |  |
Qualified Pension Plans |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Expected company contribution |  |  |  | 0 |  |
Qualified Pension Plans | Discretionary |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  | 10,000,000 |  |
Postretirement Benefit Plans |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Distributions from existing plan assets |  |  |  | 898,000 | 670,000 |
Amortization from accumulated other comprehensive income into net periodic cost (benefit) |  |  |  | (700,000) |  |
Contribution of company to company pension plans |  |  |  | 674,000 | 478,000 |
Contributions by participants |  |  |  | 224,000 | 192,000 |
Multiemployer Plans |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Expense under plans |  |  |  | $ 2,100,000 | $ 2,100,000 | $ 1,900,000
Red Zone |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Percentage of funded under multi employer plans |  |  |  | Less than 65 percent |  |
Yellow Zone |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Percentage of funded under multi employer plans |  |  |  | Between 65 and less than 80 percent |  |
Green Zone |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Percentage of funded under multi employer plans |  |  |  | At least 80 percent |  |

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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + 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=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=49170737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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