Segment Information (Schedule of Certain Segment Data) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 02, 2013	Dec. 01, 2012	Sep. 01, 2012	Jun. 02, 2012	Mar. 03, 2012	Nov. 26, 2011	Aug. 27, 2011	May 28, 2011	Mar. 02, 2013	Mar. 03, 2012	Feb. 26, 2011
Segment Reporting Information [Line Items]
Net sales	$ 179,734	$ 190,416	$ 175,940	$ 154,134	$ 168,715	$ 174,853	$ 165,557	$ 153,338	$ 700,224	$ 662,463	$ 582,777
Operating Income (Loss) from continuing operations									27,419	3,816	(20,972)
Depreciation and Amortization from continuing operations									26,529	27,246	28,218
Capital Expenditures from continuing operations									34,664	9,650	9,126
Identifiable Assets	520,141				493,104				520,141	493,104	511,098
Architectural glass
Segment Reporting Information [Line Items]
Net sales									266,456	278,087	233,164
Operating Income (Loss) from continuing operations									(4,391)	(19,595)	(49,126)
Depreciation and Amortization from continuing operations									12,230	13,585	13,239
Capital Expenditures from continuing operations									17,373	4,335	3,488
Identifiable Assets	180,662				172,265				180,662	172,265	191,137
Architectural framing systems
Segment Reporting Information [Line Items]
Net sales									191,137	174,930	132,371
Operating Income (Loss) from continuing operations									14,584	10,402	189
Depreciation and Amortization from continuing operations									6,477	6,884	7,901
Capital Expenditures from continuing operations									8,151	2,232	1,901
Identifiable Assets	111,782				108,277				111,782	108,277	105,573
Architectural services
Segment Reporting Information [Line Items]
Net sales									186,570	149,779	152,909
Operating Income (Loss) from continuing operations									(1,008)	(2,879)	11,269
Depreciation and Amortization from continuing operations									844	509	651
Capital Expenditures from continuing operations									3,939	358	430
Identifiable Assets	54,696				42,433				54,696	42,433	40,327
Large-scale optical
Segment Reporting Information [Line Items]
Net sales									79,947	78,532	75,426
Operating Income (Loss) from continuing operations									20,993	19,605	20,540
Depreciation and Amortization from continuing operations									4,634	4,607	4,694
Capital Expenditures from continuing operations									2,792	1,244	652
Identifiable Assets	59,348				59,824				59,348	59,824	65,291
Intersegment elimination
Segment Reporting Information [Line Items]
Net sales									(23,886)	(18,865)	(11,093)
Corporate and other
Segment Reporting Information [Line Items]
Operating Income (Loss) from continuing operations									(2,759)	(3,717)	(3,844)
Depreciation and Amortization from continuing operations									2,344	1,661	1,733
Capital Expenditures from continuing operations									2,409	1,481	2,655
Identifiable Assets	$ 113,653				$ 110,305				$ 113,653	$ 110,305	$ 108,770