Note 9 - Accounting for Share-based Compensation - Nonvested Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	12 Months Ended
	Nov. 27, 2021	Nov. 28, 2020	Nov. 30, 2019	Dec. 01, 2018
Nonvested (in shares)	432,349	487,997	414,353
Nonvested, Weighted average grant date fair value (in dollars per share)	$ 46.22	$ 46.56	$ 47.45
Nonvested, Weighted average remaining contractual life (Year)	1 year 10 months 24 days	9 months 18 days	9 months 18 days	1 year
Granted (in shares)	356,779	216,293	302,132
Granted, Weighted average grant date fair value (in dollars per share)	$ 54.49	$ 46.39	$ 44.29
Granted, Weighted average remaining contractual life (Year)	3 years 2 months 12 days	3 years 4 months 24 days	2 years 2 months 12 days
Vested (in shares)	(157,945)	(221,275)	(197,349)
Vested, Weighted average grant date fair value (in dollars per share)	$ 48.69	$ 46.83	$ 45.45
Forfeited (in shares)	(78,818)	(50,666)	(31,139)
Forfeited, Weighted average grant date fair value (in dollars per share)	$ 47.79	$ 47.55	$ 43.37
Forfeited, Weighted average remaining contractual life (Year)	9 months 18 days	1 month 6 days	4 months 24 days
Nonvested (in shares)	552,365	432,349	487,997	414,353
Nonvested, Weighted average grant date fair value (in dollars per share)	$ 50.63	$ 46.22	$ 46.56	$ 47.45