Note 16 - Quarterly Data (Unaudited) - Quarterly Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 03, 2016		Aug. 27, 2016		May 29, 2016		Feb. 27, 2016		Nov. 28, 2015	Aug. 29, 2015	May 30, 2015	Feb. 28, 2015	Dec. 03, 2016	Nov. 28, 2015	Nov. 29, 2014
Sales revenue	$ 574,907		$ 512,858		$ 532,514		$ 474,326		$ 548,104	$ 524,133	$ 540,762	$ 470,661	$ 2,094,605	$ 2,083,660	$ 2,104,454
Gross profit	167,821		146,121		158,256		137,605		156,060	146,840	148,937	116,206	609,803	568,043	533,290
Selling, general and administrative expenses	(106,495)	[1]	(97,692)	[1]	(103,684)	[1]	(99,767)	[1]	(103,846)	(98,297)	(100,582)	(94,833)	(407,638)	(397,558)	(383,449)
Other Nonrecurring (Income) Expense	(1,856)		2,807		(370)		(413)		(62)	(1,297)	(934)	(2,361)	(168)	4,654	51,501
Income from continuing operations	$ 39,227		$ 32,798		$ 33,390		$ 18,967		$ 25,100	$ 26,886	$ 26,616	$ 9,795	$ 124,382	$ 88,397	$ 50,151
Basic Income per share (in dollars per share)	$ 0.78		$ 0.65		$ 0.66		$ 0.38		$ 0.50	$ 0.53	$ 0.53	$ 0.19	$ 2.48	$ 1.75	$ 1
Diluted Income per share (in dollars per share)	$ 0.76		$ 0.64		$ 0.65		$ 0.37		$ 0.49	$ 0.52	$ 0.51	$ 0.19	$ 2.42	$ 1.71	$ 0.97
Weighted-average common shares – basic (in shares)	50,180		50,261		50,145		49,958		50,143	50,421	50,345	50,188	50,136	50,274	50,006
Diluted (in shares)	51,378		51,453		51,253		50,995		51,194	51,530	51,471	51,379	51,270	51,393	51,255

[1] Includes a $5,231 gain relating to a mark to market adjustment on our contingent consideration liability in the fourth quarter of 2016.