Note 4 - Supplemental Financial Statement Information - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 28, 2020	Nov. 30, 2019	Dec. 01, 2018
Balance at beginning of year	$ 10,682	$ 14,017	$ 11,670
Charged to expenses and other adjustments	8,313	2,678	6,445
Write-offs	(6,158)	(5,947)	(2,187)
Foreign currency translation effect	68	(66)	(1,911)
Balance at end of year	$ 12,905	$ 10,682	$ 14,017