Note 9 - Accounting for Share-based Compensation (Details Textual) - USD ($) $ in Thousands		12 Months Ended
Oct. 20, 2017	Dec. 02, 2017	Dec. 03, 2016	Nov. 28, 2015
Excess Tax Benefit from Share-based Compensation, Financing Activities		$ 2,010	$ 1,641	$ 1,433
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation		23,886
Fair Value Options Granted During Period Value Share-based Compensation		17,157	6,615	7,632
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 8,677	11,675	5,327
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		7 years 146 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		$ 53,142
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		5 years 109 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value		$ 36,642
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options		17,705	11,269	4,631
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options		2,723	3,506	1,890
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		7,708	$ 6,257	$ 6,192
Total Fair Value of Nonvested Restricted Stock		$ 20,710
Repurchased Restricted Stock Shares		56,230	67,807	54,454
Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense		$ 17,503	$ 13,344	$ 14,156
Non Employee Directors [Member]
Deferred Compensation Plan, Matching Percentage		10.00%
Deferred Compensation Arrangement with Individual, Discretionary Awards, Employer Contribution Units Paid		15,738	18,186	20,005
Deferred Compensation Arrangement with Individual, Employer Matches Contribution Fair Value		$ 133	$ 156	$ 122
Deferred Compensation Arrangement with Individual, Discretionary Awards Employer Contribution, Fair Value		$ 805	800	800
Employees [Member]
Deferred Compensation Plan, Matching Percentage		10.00%
Deferred Compensation Arrangement with Individual, Employer Matches Contribution Fair Value		$ 26	18	17
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year
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 Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		$ 14,934
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		1 year 219 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year
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		3 years
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense		$ 3,059	$ 2,080	$ 1,878
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		$ 12,427
Performance Shares [Member] \| Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Option Price, Percent Increase	150.00%

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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The percentage increase of the targeted stock option price based on EBITDA performance.

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

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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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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Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

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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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