Note 8 - Accounting for Share-based Compensation (Details Textual) - USD ($) $ in Thousands	3 Months Ended
Mar. 04, 2017	Feb. 27, 2016
Allocated Share-based Compensation Expense	$ 5,032	$ 4,267
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	1,053
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation		341
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	11,388
Fair Value Options Granted During Period Value Share-based Compensation	7,384	6,138
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	4,420	11
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	8,549	32
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	6,941	$ 5,833
Total Fair Value of Nonvested Restricted Stock	$ 21,214
Repurchased Restricted Stock Shares	50,687	66,447
Employees [Member]
Deferred Compensation Plan, Matching Percentage	10.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	1 year 219 days
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 18,035
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 255 days

Percent matched on deferred compensation investment.

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Fair value of options granted during the period.

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Shares of restricted stock repurchased during the period.

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Fair value of non-vested restricted stock.

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Amount of decrease in additional paid in capital (APIC) resulting from a tax deficiency associated with a share-based compensation plan other than an employee stock ownership plan (ESOP).

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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