Note 7 - Accounting for Share-based Compensation - Stock Option Activity (Details)	9 Months Ended
	Aug. 29, 2020 $ / shares shares
Outstanding Options (in shares) | shares	5,060,310
Outstanding Options, weighted-average exercise price (in dollars per share) | $ / shares	$ 46.04
Granted (in shares) | shares	1,052,968
Granted, weighted-average exercise price (in dollars per share) | $ / shares	$ 47.70
Exercised (in shares) | shares	(227,421)
Exercised, weighted-average exercise price (in dollars per share) | $ / shares	$ 28.95
Forfeited or cancelled (in shares) | shares	(164,697)
Forfeited or cancelled, weighted-average exercise price (in dollars per share) | $ / shares	$ 49.10
Outstanding Options (in shares) | shares	5,721,160
Outstanding Options, weighted-average exercise price (in dollars per share) | $ / shares	$ 46.94