Business Segment Data (Schedule of Certain Segment Data) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 27, 2016	Nov. 28, 2015	Aug. 29, 2015	May. 30, 2015	Feb. 28, 2015	Nov. 29, 2014	Aug. 30, 2014	May. 31, 2014	Feb. 27, 2016	Feb. 28, 2015	Mar. 01, 2014
Segment Reporting Information [Line Items]
Net sales	$ 262,149	$ 238,324	$ 240,754	$ 239,962	$ 246,698	$ 244,410	$ 231,945	$ 210,883	$ 981,189	$ 933,936	$ 771,445
Operating Income (Loss)									97,393	63,585	40,285
Depreciation and Amortization									31,248	29,423	26,550
Capital Expenditures									42,037	27,220	41,852
Identifiable Assets	657,440				612,057				657,440	612,057	569,995
Architectural glass
Segment Reporting Information [Line Items]
Net sales									377,713	346,471	293,810
Operating Income (Loss)									35,504	16,431	3,861
Depreciation and Amortization									14,397	12,897	11,624
Capital Expenditures									17,701	12,307	31,568
Identifiable Assets	215,571				223,525				215,571	223,525	209,102
Architectural Services
Segment Reporting Information [Line Items]
Net sales									245,935	230,650	203,351
Operating Income (Loss)									11,687	7,442	4,479
Depreciation and Amortization									1,274	1,375	1,421
Capital Expenditures									929	595	1,195
Identifiable Assets	81,574				68,930				81,574	68,930	66,567
Architectural framing systems
Segment Reporting Information [Line Items]
Net sales									308,593	298,395	216,059
Operating Income (Loss)									31,911	21,808	14,930
Depreciation and Amortization									8,019	8,001	6,436
Capital Expenditures									19,166	9,238	7,008
Identifiable Assets	193,823				190,106				193,823	190,106	186,520
Large-scale optical
Segment Reporting Information [Line Items]
Net sales									88,541	87,693	81,127
Operating Income (Loss)									22,963	21,954	21,252
Depreciation and Amortization									4,998	4,817	4,861
Capital Expenditures									1,962	3,500	546
Identifiable Assets	57,369				60,356				57,369	60,356	58,102
Intersegment elimination
Segment Reporting Information [Line Items]
Net sales									(39,593)	(29,273)	(22,902)
Corporate and other
Segment Reporting Information [Line Items]
Operating Income (Loss)									(4,672)	(4,050)	(4,237)
Depreciation and Amortization									2,560	2,333	2,208
Capital Expenditures									2,279	1,580	1,535
Identifiable Assets	$ 109,103				$ 69,140				$ 109,103	$ 69,140	$ 49,704