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 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 amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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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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Tax effect of curtailment of a plan resulting from a plan amendment that occurred during the period. The benefit has not been recognized in net periodic benefit cost.

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

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Pension and Other Postretirement Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		3 Months Ended
	Mar. 25, 2012	Dec. 25, 2011	Mar. 25, 2012 Pension Plans, Defined Benefit [Member]	Mar. 27, 2011 Pension Plans, Defined Benefit [Member]	Mar. 25, 2012 Qualified Plans [Member]	Mar. 27, 2011 Qualified Plans [Member]	Mar. 25, 2012 Non-Qualified Plans [Member]	Mar. 27, 2011 Non-Qualified Plans [Member]	Mar. 25, 2012 Contributions to New York Times Newspaper Guild Pension Plan[Member]	Mar. 25, 2012 Other Postretirement Benefit Plans, Defined Benefit [Member]	Mar. 27, 2011 Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Effect of remeasurement and curtailment	$ 3,000
Net periodic benefit cost/(income)
Service cost			3,384	3,396	3,007	3,019	377	377		239	290
Interest cost			27,352	28,284	24,187	24,998	3,165	3,286		1,246	1,825
Expected return on plan assets			(29,577)	(27,953)	(29,577)	(27,953)	0	0
Amortization of prior service cost/(credit)			201	201	201	201	0	0		(3,778)	(3,901)
Recognized actuarial loss			8,628	7,249	7,466	6,445	1,162	804		832	481
Curtailment gain										(27,213)	0
Net periodic benefit cost/(income)			9,988	11,177	5,284	6,710	4,704	4,467		(28,674)	(1,305)
Estimated future contributions to pension plans based on contractual obligations for next fiscal year		47,000
Contributions to certain qualified pension plans									$ 12,000