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Employee Benefit Plans (Detail) - Components of other postretirement benefit cost: (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Interest cost	$ 34	$ 36	$ 99	$ 115
Amortization of prior service benefit	(44)	(48)	(133)	(133)
Amortization of accumulated loss (benefit)	10	(2)	24	15
Net periodic postretirement benefit	$ 0	$ (14)	$ (10)	$ (3)

- 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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