Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 29, 2014	Nov. 30, 2013	Nov. 29, 2014	Nov. 30, 2013
Sales and operating income data
Net sales	$ 244,410	$ 199,430	$ 687,238	$ 557,028
Operating income (loss)	20,625	12,707	43,938	28,180
Architectural Glass [Member]
Sales and operating income data
Net sales	90,268	73,365	254,138	218,142
Operating income (loss)	5,836	1,641	11,935	3,782
Architectural Services segment [Member]
Sales and operating income data
Net sales	56,178	51,167	167,146	139,820
Operating income (loss)	323	351	2,279	(1,401)
Architectural Framing Systems Segment [Member]
Sales and operating income data
Net sales	80,411	58,981	221,369	152,877
Operating income (loss)	7,596	5,782	16,974	13,026
Large-Scale Optical [Member]
Sales and operating income data
Net sales	25,546	22,699	64,969	61,917
Operating income (loss)	7,879	6,058	15,990	16,072
Intersegment eliminations [Member]
Sales and operating income data
Net sales	(7,993)	(6,782)	(20,384)	(15,728)
Corporate and other [Member]
Sales and operating income data
Operating income (loss)	$ (1,009)	$ (1,125)	$ (3,240)	$ (3,299)