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Net Postretirement Benefit Cost (Detail) (Postretirement Benefit Plans, USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Oct. 02, 2011	Oct. 02, 2011
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	$ 53	$ 161
Amortization of prior service credits	(25,242)	(27,695)
Amortization of net actuarial losses	3,892	4,120
Total	$ (21,297)	$ (23,414)

- Definition

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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