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Net Periodic Cost for U.K Defined Benefit Pension Plans (Detail) (UNITED KINGDOM, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
UNITED KINGDOM
Components of the net periodic pension cost:
Interest cost	$ 356	$ 341
Expected return on plan assets	(347)	(313)
Amortization of actuarial loss	168	97
Net periodic pension cost	$ 177	$ 125

X

- Definition

The amount of gains or losses recognized in net periodic benefit cost.

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- Definition

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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- 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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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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