Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 28, 2021	Aug. 29, 2020	Aug. 28, 2021	Aug. 29, 2020
Sales and operating income data
Net sales	$ 325,797	$ 319,483	$ 651,803	$ 608,578
Operating income (loss)	(3,068)	23,215	12,973	29,683
Intersegment eliminations
Sales and operating income data
Net sales	(10,122)	(10,558)	(18,871)	(18,400)
Architectural Framing Systems
Sales and operating income data
Net sales	149,972	152,927	301,812	303,091
Operating income (loss)	8,278	11,697	16,338	18,993
Architectural Glass
Sales and operating income data
Net sales	79,373	86,584	162,404	163,495
Operating income (loss)	(16,995)	4,976	(14,867)	4,482
Architectural Services
Sales and operating income data
Net sales	83,031	73,670	158,686	137,221
Operating income (loss)	7,242	6,569	11,779	11,912
Large-Scale Optical
Sales and operating income data
Net sales	23,543	16,860	47,772	23,171
Operating income (loss)	5,483	2,149	11,330	(984)
Corporate and other
Sales and operating income data
Operating income (loss)	$ (7,076)	$ (2,176)	$ (11,607)	$ (4,720)