Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 29, 2020	Aug. 31, 2019	Aug. 29, 2020	Aug. 31, 2019
Sales and operating income data
Net sales	$ 319,483	$ 357,058	$ 608,578	$ 712,424
Operating income (loss)	23,215	27,576	29,683	50,616
Architectural Framing Systems
Sales and operating income data
Net sales	152,927	187,394	303,091	367,916
Operating income (loss)	11,697	15,523	18,993	27,796
Architectural Glass
Sales and operating income data
Net sales	86,584	99,138	163,495	199,429
Operating income (loss)	4,976	6,460	4,482	12,859
Architectural Services
Sales and operating income data
Net sales	73,670	61,597	137,221	126,744
Operating income (loss)	6,569	3,976	11,912	8,549
Large-Scale Optical
Sales and operating income data
Net sales	16,860	20,785	23,171	42,045
Operating income (loss)	2,149	4,630	(984)	8,807
Intersegment eliminations
Sales and operating income data
Net sales	(10,558)	(11,856)	(18,400)	(23,710)
Corporate and other
Sales and operating income data
Operating income (loss)	$ (2,176)	$ (3,013)	$ (4,720)	$ (7,395)