A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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The sum of other amounts reflected in the reconciliation of the statutory tax provision (benefit) to the actual tax provision (benefit).

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Provision for Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
Provision for Income Taxes (Details) (USD $)	Aug. 28, 2011	Aug. 29, 2010	Aug. 28, 2011	Aug. 29, 2010	Nov. 30, 2010
Income Tax Disclosure [Abstract]
Income taxes expense (benefit)	$ (1,743,000)	$ 1,349,000	$ (2,553,000)	$ 4,008,000
Decrease in deferred tax assets valuation allowance		599,000
Decrease in then current taxes payable		361,000
Tax benefits which reduce effective tax rate			2,430,000,000
Effective tax rate			135.00%	16.00%
Income Tax Contingency [Line Items]
Unrecognized tax benefits	9,956,000		9,956,000		11,452,000
Unrecognized tax benefits that would impact effective tax rate	4,110,000		4,110,000
Significant change in unrecognized tax benefits reasonably possible	665,000		665,000
Unrecognized tax benefits, income tax penalties and interest accrued	$ 854,000		$ 854,000		$ 1,153,000