Summary of Prepaid Expenses and Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 25, 2010	Sep. 25, 2010
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Income taxes receivable	$ 7,762	$ 5,626
Prepaid expenses	3,866	3,304
Grant receivable - environmental remediation (see Note I)	2,589	2,589	2,589
Other assets	388	1,237
Prepaid expenses and other assets	$ 14,605	$ 12,756

Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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The total of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer, and the aggregate carrying amount of current assets, as of the balance sheet date, not separately presented elsewhere in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

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- Definition

Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer.

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