Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 29, 2015	Aug. 30, 2014	Aug. 29, 2015	Aug. 30, 2014
Sales and operating income data
Net sales	$ 240,754	$ 231,945	$ 480,716	$ 442,828
Operating income (loss)	22,423	15,496	40,647	23,313
Architectural Glass [Member]
Sales and operating income data
Net sales	92,433	84,236	193,608	163,870
Operating income (loss)	6,738	3,299	15,021	6,099
Architectural Services segment [Member]
Sales and operating income data
Net sales	52,197	59,352	107,849	110,967
Operating income (loss)	1,419	1,772	2,361	1,956
Architectural Framing Systems Segment [Member]
Sales and operating income data
Net sales	80,671	76,736	152,571	140,958
Operating income (loss)	9,692	7,446	14,953	9,377
Large-Scale Optical [Member]
Sales and operating income data
Net sales	22,444	19,363	42,663	39,423
Operating income (loss)	5,642	4,147	10,512	8,111
Intersegment eliminations [Member]
Sales and operating income data
Net sales	(6,991)	(7,742)	(15,975)	(12,390)
Corporate and other [Member]
Sales and operating income data
Operating income (loss)	$ (1,068)	$ (1,168)	$ (2,200)	$ (2,230)