Pension and Other Postretirement Benefits (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 25, 2011	Jun. 26, 2011	Sep. 26, 2010	Sep. 25, 2011	Sep. 26, 2010	Dec. 26, 2010
Pension
Pension withdrawal expense	$ 0	$ 4,228	$ 6,268	$ 4,228	$ 6,268
Net periodic benefit cost/(income)
Contributions to certain qualified pension plans				70,000
Estimated future contributions to pension plans based on contractual obligations for next fiscal year						32,000
Pension Plans, Defined Benefit [Member]
Net periodic benefit cost/(income)
Service cost	3,396		2,952	10,188	9,151
Interest cost	28,284		28,358	84,852	86,982
Expected return on plan assets	(27,953)		(28,420)	(83,859)	(85,205)
Amortization of prior service cost	201		201	603	603
Recognized actuarial loss	7,249		4,649	21,747	15,949
Net periodic benefit cost/(income)	11,177		7,740	33,531	27,480
Qualified Plans [Member]
Net periodic benefit cost/(income)
Service cost	3,019		2,937	9,057	9,106
Interest cost	24,998		24,996	74,994	76,895
Expected return on plan assets	(27,953)		(28,420)	(83,859)	(85,205)
Amortization of prior service cost	201		201	603	603
Recognized actuarial loss	6,445		4,084	19,335	12,412
Net periodic benefit cost/(income)	6,710		3,798	20,130	13,811
Non-Qualified Plans [Member]
Net periodic benefit cost/(income)
Service cost	377		15	1,131	45
Interest cost	3,286		3,362	9,858	10,087
Expected return on plan assets	0		0	0	0
Amortization of prior service cost	0		0	0	0
Recognized actuarial loss	804		565	2,412	3,537
Net periodic benefit cost/(income)	4,467		3,942	13,401	13,669
Other Postretirement Benefit Plans, Defined Benefit [Member]
Net periodic benefit cost/(income)
Service cost	290		269	870	807
Interest cost	1,825		2,335	5,475	7,005
Amortization of prior service cost	(3,901)		(3,900)	(11,703)	(11,700)
Recognized actuarial loss	481		782	1,443	2,346
Net periodic benefit cost/(income)	(1,305)		(514)	(3,915)	(1,542)
Contributions to New York Times Newspaper Guild Pension Plan[Member]
Net periodic benefit cost/(income)
Contributions to certain qualified pension plans				$ 26,000

The expense for the present value of future payments related to the withdrawal from multi-employer pension plan(s).

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The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The employer's best estimate, as soon as it can be reasonably determined, 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. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

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