Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 27, 2016	Aug. 29, 2015	Aug. 27, 2016	Aug. 29, 2015
Sales and operating income data
Net sales	$ 278,455	$ 240,754	$ 526,335	$ 480,716
Operating income (loss)	33,048	22,423	59,297	40,647
Architectural Glass [Member]
Sales and operating income data
Net sales	99,205	92,433	192,565	193,608
Operating income (loss)	9,616	6,738	19,147	15,021
Architectural Services segment [Member]
Sales and operating income data
Net sales	77,734	52,197	140,554	107,849
Operating income (loss)	6,236	1,419	9,418	2,361
Architectural Framing Systems Segment [Member]
Sales and operating income data
Net sales	92,229	80,671	173,362	152,571
Operating income (loss)	13,001	9,692	23,232	14,953
Large-Scale Optical [Member]
Sales and operating income data
Net sales	21,270	22,444	41,298	42,663
Operating income (loss)	5,051	5,642	9,703	10,512
Intersegment eliminations [Member]
Sales and operating income data
Net sales	(11,983)	(6,991)	(21,444)	(15,975)
Corporate and other [Member]
Sales and operating income data
Operating income (loss)	$ (856)	$ (1,068)	$ (2,203)	$ (2,200)