Business Segment Data (Schedule of Certain Segment Data) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	Jun. 01, 2019	Mar. 02, 2019	Dec. 01, 2018	Sep. 01, 2018	Jun. 02, 2018	Feb. 29, 2020	Mar. 02, 2019	Mar. 03, 2018
Segment Reporting Information [Line Items]
Revenues	$ 337,100	$ 337,916	$ 357,058	$ 355,365	$ 346,255	$ 357,718	$ 362,133	$ 336,531	$ 1,387,439	$ 1,402,637	$ 1,326,173
Operating Income (Loss)									87,848	67,284	114,284
Depreciation and Amortization									46,795	49,798	54,843
Capital Expenditures									51,428	60,717	53,196
Identifiable Assets	1,128,991				1,068,168				1,128,991	1,068,168	1,022,320
Architectural Glass
Segment Reporting Information [Line Items]
Revenues									387,191	367,203	384,137
Operating Income (Loss)									20,760	16,503	32,764
Depreciation and Amortization									13,570	13,009	14,525
Capital Expenditures									19,862	27,722	26,228
Identifiable Assets	291,104				281,817				291,104	281,817	250,407
Architectural Services
Segment Reporting Information [Line Items]
Revenues									269,140	286,314	213,757
Operating Income (Loss)									23,582	30,509	10,420
Depreciation and Amortization									1,305	1,234	1,325
Capital Expenditures									1,749	1,433	2,510
Identifiable Assets	107,538				59,227				107,538	59,227	53,424
Architectural Framing Systems
Segment Reporting Information [Line Items]
Revenues									686,596	720,829	677,198
Operating Income (Loss)									36,110	49,660	59,031
Depreciation and Amortization									25,432	28,937	31,764
Capital Expenditures									22,744	19,098	15,273
Identifiable Assets	604,870				617,001				604,870	617,001	618,455
Large-Scale Optical
Segment Reporting Information [Line Items]
Revenues									87,911	88,493	88,303
Operating Income (Loss)									22,642	23,003	22,000
Depreciation and Amortization									3,256	3,692	4,556
Capital Expenditures									3,153	6,989	3,307
Identifiable Assets	62,831				61,031				62,831	61,031	58,523
Intersegment elimination
Segment Reporting Information [Line Items]
Revenues									(43,399)	(60,202)	(37,222)
Corporate and other
Segment Reporting Information [Line Items]
Operating Income (Loss)									(15,246)	(52,391)	(9,931)
Depreciation and Amortization									3,232	2,926	2,673
Capital Expenditures									3,920	5,475	5,878
Identifiable Assets	$ 62,648				$ 49,092				$ 62,648	$ 49,092	$ 41,511