Segment Information (Schedule of Certain Segment Data) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										12 Months Ended
	Feb. 28, 2015		Nov. 29, 2014	Aug. 30, 2014	May 31, 2014	Mar. 01, 2014		Nov. 30, 2013	Aug. 31, 2013	Jun. 01, 2013	Feb. 28, 2015		Mar. 01, 2014		Mar. 02, 2013
Segment Reporting Information [Line Items]
Net sales	$ 246,698		$ 244,410	$ 231,945	$ 210,883	$ 214,417		$ 199,430	$ 178,287	$ 179,311	$ 933,936		$ 771,445		$ 700,224
Operating Income (Loss)											63,585		40,285		27,419
Depreciation and Amortization											29,423		26,550		26,529
Capital Expenditures											27,220		41,852		34,664
Identifiable Assets(1)	612,057	[1]				569,995	[1]				612,057	[1]	569,995	[1]	524,779	[1]
Architectural glass
Segment Reporting Information [Line Items]
Net sales											346,471		293,810		266,456
Operating Income (Loss)											16,431		3,861		(4,391)
Depreciation and Amortization											12,897		11,624		12,230
Capital Expenditures											12,307		31,568		17,373
Identifiable Assets(1)	223,525	[1]				209,102	[1]				223,525	[1]	209,102	[1]	183,794	[1]
Architectural Services
Segment Reporting Information [Line Items]
Net sales											230,650		203,351		186,570
Operating Income (Loss)											7,442		4,479		(1,008)
Depreciation and Amortization											1,375		1,421		844
Capital Expenditures											595		1,195		3,939
Identifiable Assets(1)	68,930	[1]				66,567	[1]				68,930	[1]	66,567	[1]	54,696	[1]
Architectural framing systems
Segment Reporting Information [Line Items]
Net sales											298,395		216,059		191,137
Operating Income (Loss)											21,808		14,930		14,584
Depreciation and Amortization											8,001		6,436		6,477
Capital Expenditures											9,238		7,008		8,151
Identifiable Assets(1)	190,106	[1]				186,520	[1]				190,106	[1]	186,520	[1]	113,943	[1]
Large-scale optical
Segment Reporting Information [Line Items]
Net sales											87,693		81,127		79,947
Operating Income (Loss)											21,954		21,252		20,993
Depreciation and Amortization											4,817		4,861		4,634
Capital Expenditures											3,500		546		2,792
Identifiable Assets(1)	60,356	[1]				58,102	[1]				60,356	[1]	58,102	[1]	59,348	[1]
Intersegment elimination
Segment Reporting Information [Line Items]
Net sales											(29,273)		(22,902)		(23,886)
Corporate and other
Segment Reporting Information [Line Items]
Operating Income (Loss)											(4,050)		(4,237)		(2,759)
Depreciation and Amortization											2,333		2,208		2,344
Capital Expenditures											1,580		1,535		2,409
Identifiable Assets(1)	$ 69,140	[1]				$ 49,704	[1]				$ 69,140	[1]	$ 49,704	[1]	$ 112,998	[1]

[1] During the fourth quarter of fiscal 2015, the Company changed its method of accounting for those inventories which were accounted for under the LIFO method to the FIFO method. See Note 1 for discussion of this accounting change and its related impact.