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Defined Benefit Plan Contribution Of Pension Fund In Excess Of Total Contribution

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Defined Benefit Plan Percentage Of Funded Under Multi Employer Plans

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Defined Benefit Plan Weighted Average Annual Return On Plan Assets

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Minimum Age For Eligibility For Postretirement Benefits

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Postretirement Benefits Number Of Years Of Service For Eligibility

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The cash proceeds from the sale of company stock held by a defined benefit plan.

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Retiree Medical Plan Eligibility Requirements Continuous Service Period

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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The amount of employer securities or securities of parties related to the employer that are included in plan assets.

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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).

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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.

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The increase in the fair value of plan assets from contributions made by the employer.

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If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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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.

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Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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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.

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The amount of the cost recognized during the period for defined contribution plans.

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Number of employees eligible to participate in the defined contribution plan or plans described.

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Indicate whether the multiemployer plan is less than 65 percent funded, between 65 and less than 80 percent funded, or at least 80 percent funded. The acceptable values are: (1) "less than 65 percent", (2) "between 65 and less than 80 percent", (3) "at least 80 percent", and (4) "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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Postretirement Plans - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended			1 Months Ended
	Sep. 30, 2014 Employee	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2014	Dec. 31, 2013
Pension and Other Postretirement Benefits Disclosure [Line Items]
Number of former employees covered	2,500
Percentage reduced in plan obligations	10.00%
Settlement loss		$ 15,387,000
Expected pension income for fiscal 2015		5,800,000
Actual return on plan assets				41,900,000
Expected long-term rate of return on plan assets		8.00%
Average annual return on the plan assets over the last 15 years		7.10%
Percentage of total plan assets		100.00%	100.00%
Expected company contribution		691,000
Postretirement Benefits, minimum years of service for eligibility		10 years
Postretirement Benefits, minimum age for eligibility		55 years
Contributions by participants				400,000
Expense under plans		5,341,000	(2,041,000)	1,570,000
Total cost and employer contributions		26,200,000	23,000,000	20,300,000
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%
Lepage 401(k) Plan
Pension and Other Postretirement Benefits Disclosure [Line Items]
Total cost and employer contributions			500,000	500,000
Discretionary
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contribution of company to company pension plans		8,400,000
Common Stock
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined benefit plan equity securities included in common stock					2,030,363	3,030,363
Percentage of total plan assets					10.20%	15.10%
Equity securities, amount					39,000,000	65,100,000
Number of shares sold on open market by the plan		1,000,000
Proceeds from shares sold on open market by the plan		19,100,000
Net Periodic Pension Cost
Pension and Other Postretirement Benefits Disclosure [Line Items]
Distributions from existing plan assets		48,413,000
Settlement loss		15,387,000
Actual return on plan assets		11,613,000	73,174,000
Amortization from accumulated other comprehensive income into net periodic cost (benefit)		5,000,000
Expected long-term rate of return on plan assets		8.00%	8.00%	8.00%
Contribution of company to company pension plans		13,435,000	15,254,000
Projected Benefit Obligation
Pension and Other Postretirement Benefits Disclosure [Line Items]
Accumulated benefit obligation and projected benefit obligation in excess of plan assets		462,600,000	463,700,000
Accumulated Benefit Obligations
Pension and Other Postretirement Benefits Disclosure [Line Items]
Accumulated benefit obligation and projected benefit obligation in excess of plan assets		460,900,000	462,800,000
Fair Value Of Plan Assets
Pension and Other Postretirement Benefits Disclosure [Line Items]
Accumulated benefit obligation and projected benefit obligation in excess of plan assets		378,200,000	428,600,000
Qualified Pension Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Expected company contribution		10,000,000
Qualified Pension Plans \| Required
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contribution of company to company pension plans		4,600,000
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
Net Periodic Pension Cost
Pension and Other Postretirement Benefits Disclosure [Line Items]
Amortization from accumulated other comprehensive income into net periodic cost (benefit)		(1,100,000)
Net Periodic Postretirement Benefit Cost
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contribution of company to company pension plans		478,000	952,000
Contributions by participants		192,000	364,000
Multiemployer Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Expense under plans		2,100,000	1,900,000	1,700,000
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
Plan No. 1
Pension and Other Postretirement Benefits Disclosure [Line Items]
Distributions from existing plan assets					48,400,000
Settlement loss					15,387,000
Plan No. 2
Pension and Other Postretirement Benefits Disclosure [Line Items]
Distributions from existing plan assets					2,000,000
Settlement loss		$ 0