Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2019	Sep. 01, 2018	Aug. 31, 2019	Sep. 01, 2018
Sales and operating income data
Net sales	$ 357,058	$ 362,133	$ 712,424	$ 698,664
Operating income (loss)	27,576	28,660	50,616	50,654
Architectural Glass
Sales and operating income data
Net sales	99,138	88,084	199,429	165,009
Operating income (loss)	6,460	1,739	12,859	3,317
Architectural Services
Sales and operating income data
Net sales	61,597	76,496	126,744	147,223
Operating income (loss)	3,976	7,621	8,549	12,775
Architectural Framing Systems
Sales and operating income data
Net sales	187,394	189,850	367,916	368,887
Operating income (loss)	15,523	18,312	27,796	30,650
Large-Scale Optical
Sales and operating income data
Net sales	20,785	20,383	42,045	41,145
Operating income (loss)	4,630	4,236	8,807	9,218
Intersegment eliminations
Sales and operating income data
Net sales	(11,856)	(12,680)	(23,710)	(23,600)
Corporate and other
Sales and operating income data
Operating income (loss)	$ (3,013)	$ (3,248)	$ (7,395)	$ (5,306)