Note 3 - Accounting for Share-based Compensation (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 03, 2016	Nov. 28, 2015	Nov. 29, 2014
Excess Tax Benefit from Share-based Compensation, Financing Activities	$ 1,641	$ 1,433	$ 3,357
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	21,871
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	6,528
Fair Value Options Granted During Period Value Share-based Compensation	6,615	7,632	6,599
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 11,675	5,327	8,915
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	1 year 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 35,223
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	5 years 146 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 23,066
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	11,269	4,631	6,852
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	3,506	1,890	3,038
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	6,257	$ 6,192	$ 8,782
Total Fair Value of Nonvested Restricted Stock	$ 14,947
Repurchased Restricted Stock Shares	67,807	54,454	67,593
Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense	$ 13,344	$ 14,156	$ 13,376
Non Employee Directors [Member]
Deferred Compensation Plan, Matching Percentage	10.00%
Deferred Compensation Arrangement with Individual, Discretionary Awards, Employer Contribution Units Paid	18,186	20,005
Deferred Compensation Arrangement with Individual, Employer Matches Contribution Fair Value	$ 156	$ 122	130
Deferred Compensation Arrangement with Individual, Discretionary Awards Employer Contribution, Fair Value	$ 800	800	720
Employees [Member]
Deferred Compensation Plan, Matching Percentage	10.00%
Deferred Compensation Arrangement with Individual, Employer Matches Contribution Fair Value	$ 18	17	19
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	328 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.30%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Employee Stock Option [Member] \| Minimum [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year
Restricted Stock [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	36 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.30%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 66
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 2,080	$ 1,878	$ 2,690
Restricted Stock [Member] \| Minimum [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 8,085

The fair value of the discretionary award amount contributed into the deferred compensation arrangement.

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Discretionary awards included in the company's match for deferred compensation arrangement.

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The fair value of the matched amount into the deferred compensation fund established for purposes of future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

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Fair value of options granted during the period.

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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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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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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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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