Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 01, 2018	Sep. 02, 2017	Sep. 01, 2018	Sep. 02, 2017
Sales and operating income data
Net sales	$ 362,133	$ 343,907	$ 698,664	$ 616,214
Operating income (loss)	28,660	27,774	50,654	51,880
Architectural Glass
Sales and operating income data
Net sales	88,084	97,351	165,009	195,086
Operating income (loss)	1,739	10,258	3,317	19,581
Architectural Services
Sales and operating income data
Net sales	76,496	46,829	147,223	96,979
Operating income (loss)	7,621	774	12,775	1,555
Architectural Framing Systems
Sales and operating income data
Net sales	189,850	189,023	368,887	299,515
Operating income (loss)	18,312	16,542	30,650	28,506
Large-Scale Optical
Sales and operating income data
Net sales	20,383	20,291	41,145	38,894
Operating income (loss)	4,236	4,248	9,218	8,298
Intersegment eliminations
Sales and operating income data
Net sales	(12,680)	(9,587)	(23,600)	(14,260)
Corporate and other
Sales and operating income data
Operating income (loss)	$ (3,248)	$ (4,048)	$ (5,306)	$ (6,060)