Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	May. 30, 2015	May. 31, 2014
Sales and operating income data
Net sales	$ 239,962	$ 210,883
Operating income (loss)	18,224	7,817
Architectural Glass [Member]
Sales and operating income data
Net sales	101,175	79,634
Operating income (loss)	8,283	2,800
Architectural Services segment [Member]
Sales and operating income data
Net sales	55,652	51,616
Operating income (loss)	942	184
Architectural Framing Systems Segment [Member]
Sales and operating income data
Net sales	71,900	64,222
Operating income (loss)	5,261	1,931
Large-Scale Optical [Member]
Sales and operating income data
Net sales	20,219	20,061
Operating income (loss)	4,870	3,964
Intersegment eliminations [Member]
Sales and operating income data
Net sales	(8,984)	(4,650)
Corporate and other [Member]
Sales and operating income data
Operating income (loss)	$ (1,132)	$ (1,062)