Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	May 31, 2014	Jun. 01, 2013
Sales and operating income data
Net sales	$ 210,883	$ 179,311
Operating income (loss)	7,817	6,115
Architectural Glass [Member]
Sales and operating income data
Net sales	79,634	74,803
Operating income (loss)	2,800	1,371
Architectural Services segment [Member]
Sales and operating income data
Net sales	51,616	46,476
Operating income (loss)	184	(965)
Architectural Framing Systems Segment [Member]
Sales and operating income data
Net sales	64,222	44,446
Operating income (loss)	1,931	2,064
Large-Scale Optical [Member]
Sales and operating income data
Net sales	20,061	19,473
Operating income (loss)	3,964	4,698
Intersegment eliminations [Member]
Sales and operating income data
Net sales	(4,650)	(5,887)
Corporate and other [Member]
Sales and operating income data
Operating income (loss)	$ (1,062)	$ (1,053)