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Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Jun. 24, 2012	Dec. 25, 2011	Dec. 26, 2010
Property and equipment
Historical Cost	$ 336,031	$ 334,141	$ 328,264
Net Book Value	160,082	167,145	179,997
Vessels and Vessel improvements [Member]
Property and equipment
Historical Cost	152,439	150,658	147,032
Net Book Value	64,295	67,379	74,057
Containers [Member]
Property and equipment
Historical Cost	37,362	37,831	37,212
Net Book Value	22,188	23,114	24,089
Chassis [Member]
Property and equipment
Historical Cost	12,556	12,713	12,449
Net Book Value	4,866	5,429	5,938
Cranes [Member]
Property and equipment
Historical Cost	27,722	27,641	26,744
Net Book Value	14,132	15,144	16,253
Machinery and Equipment [Member]
Property and equipment
Historical Cost	31,866	31,015	28,962
Net Book Value	10,993	11,661	11,206
Facilities and land improvements [Member]
Property and equipment
Historical Cost	28,030	27,257	26,355
Net Book Value	21,348	21,293	21,176
Software [Member]
Property and equipment
Historical Cost	25,175	25,169	23,837
Net Book Value	1,379	1,268	1,605
Construction in Progress [Member]
Property and equipment
Historical Cost	20,881	21,857	23,673
Net Book Value	$ 20,881	$ 21,857	$ 25,673

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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