Business Segment Data (Schedule of Certain Segment Data) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 04, 2017	Nov. 26, 2016	Aug. 27, 2016	May 28, 2016	Feb. 27, 2016	Nov. 28, 2015	Aug. 29, 2015	May 30, 2015	Mar. 04, 2017	Feb. 27, 2016	Feb. 28, 2015
Segment Reporting Information [Line Items]
Net sales	$ 314,126	$ 274,072	$ 278,455	$ 247,880	$ 262,149	$ 238,324	$ 240,754	$ 239,962	$ 1,114,533	$ 981,189	$ 933,936
Operating Income (Loss)									122,225	97,393	63,585
Depreciation and Amortization									35,607	31,248	29,423
Capital Expenditures									68,061	42,037	27,220
Identifiable Assets	784,658				657,440				784,658	657,440	612,057
Architectural Glass
Segment Reporting Information [Line Items]
Net sales									411,881	377,713	346,471
Operating Income (Loss)									44,656	35,504	16,431
Depreciation and Amortization									15,912	14,397	12,897
Capital Expenditures									44,439	17,701	12,307
Identifiable Assets	254,840				215,571				254,840	215,571	223,525
Architectural Services
Segment Reporting Information [Line Items]
Net sales									270,937	245,935	230,650
Operating Income (Loss)									18,494	11,687	7,442
Depreciation and Amortization									1,364	1,274	1,375
Capital Expenditures									1,981	929	595
Identifiable Assets	70,875				81,574				70,875	81,574	68,930
Architectural Framing Systems
Segment Reporting Information [Line Items]
Net sales									385,978	308,593	298,395
Operating Income (Loss)									44,768	31,911	21,808
Depreciation and Amortization									12,404	8,019	8,001
Capital Expenditures									14,070	19,166	9,238
Identifiable Assets	359,633				193,823				359,633	193,823	190,106
Large-Scale Optical
Segment Reporting Information [Line Items]
Net sales									89,710	88,541	87,693
Operating Income (Loss)									22,467	22,963	21,954
Depreciation and Amortization									4,785	4,998	4,817
Capital Expenditures									1,510	1,962	3,500
Identifiable Assets	58,198				57,369				58,198	57,369	60,356
Intersegment elimination
Segment Reporting Information [Line Items]
Net sales									(43,973)	(39,593)	(29,273)
Corporate and other
Segment Reporting Information [Line Items]
Operating Income (Loss)									(8,160)	(4,672)	(4,050)
Depreciation and Amortization									1,142	2,560	2,333
Capital Expenditures									6,061	2,279	1,580
Identifiable Assets	$ 41,112				$ 109,103				$ 41,112	$ 109,103	$ 69,140