Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 01, 2013	Jun. 02, 2012
Sales and operating income data
Net sales	$ 179,311	$ 154,134
Operating income (loss)	6,115	2,318
Architectural Glass [Member]
Sales and operating income data
Net sales	74,803	59,066
Operating income (loss)	1,371	(2,406)
Architectural Services segment [Member]
Sales and operating income data
Net sales	46,476	38,918
Operating income (loss)	(965)	(2,579)
Architectural Framing Segment [Member]
Sales and operating income data
Net sales	44,446	42,407
Operating income (loss)	2,064	3,096
Large-Scale Optical [Member]
Sales and operating income data
Net sales	19,473	19,258
Operating income (loss)	4,698	5,268
Intersegment eliminations [Member]
Sales and operating income data
Net sales	(5,887)	(5,515)
Corporate and other [Member]
Sales and operating income data
Operating income (loss)	$ (1,053)	$ (1,061)