Business Segment Data (Schedule of Certain Segment Data) (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 26, 2022	Feb. 27, 2021	Feb. 29, 2020
Segment Reporting Information [Line Items]
Revenues	$ 1,313,977	$ 1,230,774	$ 1,387,439
Operating (Loss) Income	22,045	25,527	87,848
Depreciation and Amortization	49,993	51,440	46,795
Capital Expenditures	21,841	26,165	51,428
Identifiable Assets	887,863	1,015,099	1,128,991
Intersegment elimination
Segment Reporting Information [Line Items]
Revenues	(42,931)	(36,189)	(43,399)
Architectural Framing Systems
Segment Reporting Information [Line Items]
Revenues	596,608	570,850	686,596
Operating (Loss) Income	(16,726)	(44,761)	36,110
Depreciation and Amortization	26,434	27,298	25,432
Capital Expenditures	8,101	9,907	22,744
Identifiable Assets	466,141	511,608	604,870
Architectural Glass
Segment Reporting Information [Line Items]
Revenues	309,241	330,256	387,191
Operating (Loss) Income	1,785	18,678	20,760
Depreciation and Amortization	14,564	15,102	13,570
Capital Expenditures	5,865	9,574	19,862
Identifiable Assets	225,362	271,520	291,104
Architectural Services
Segment Reporting Information [Line Items]
Revenues	349,386	295,807	269,140
Operating (Loss) Income	32,743	31,182	23,582
Depreciation and Amortization	1,422	1,430	1,305
Capital Expenditures	2,692	1,480	1,749
Identifiable Assets	61,991	79,465	107,538
Large-Scale Optical
Segment Reporting Information [Line Items]
Revenues	101,673	70,050	87,911
Operating (Loss) Income	23,618	31,203	22,642
Depreciation and Amortization	3,185	3,338	3,256
Capital Expenditures	2,250	869	3,153
Identifiable Assets	56,926	64,474	62,831
Corporate and other
Segment Reporting Information [Line Items]
Operating (Loss) Income	(19,375)	(10,775)	(15,246)
Depreciation and Amortization	4,388	4,272	3,232
Capital Expenditures	2,933	4,335	3,920
Identifiable Assets	$ 77,443	$ 88,032	$ 62,648