Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 30, 2014	Aug. 31, 2013	Aug. 30, 2014	Aug. 31, 2013
Sales and operating income data
Net sales	$ 231,945	$ 178,287	$ 442,828	$ 357,598
Operating income (loss)	15,496	9,358	23,313	15,472
Architectural Glass [Member]
Sales and operating income data
Net sales	84,236	69,974	163,870	144,777
Operating income (loss)	3,299	770	6,099	2,141
Architectural Services segment [Member]
Sales and operating income data
Net sales	59,352	42,177	110,967	88,653
Operating income (loss)	1,772	(787)	1,956	(1,752)
Architectural Framing Systems Segment [Member]
Sales and operating income data
Net sales	76,736	49,450	140,958	93,896
Operating income (loss)	7,446	5,180	9,377	7,244
Large-Scale Optical [Member]
Sales and operating income data
Net sales	19,363	19,745	39,423	39,218
Operating income (loss)	4,147	5,316	8,111	10,014
Intersegment eliminations [Member]
Sales and operating income data
Net sales	(7,742)	(3,059)	(12,390)	(8,946)
Corporate and other [Member]
Sales and operating income data
Operating income (loss)	$ (1,168)	$ (1,121)	$ (2,230)	$ (2,175)