Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	May 28, 2016	May 30, 2015
Sales and operating income data
Net sales	$ 247,880	$ 239,962
Operating income (loss)	26,249	18,224
Architectural Glass [Member]
Sales and operating income data
Net sales	93,360	101,175
Operating income (loss)	9,531	8,283
Architectural Services segment [Member]
Sales and operating income data
Net sales	62,820	55,652
Operating income (loss)	3,181	942
Architectural Framing Systems Segment [Member]
Sales and operating income data
Net sales	81,132	71,900
Operating income (loss)	10,232	5,261
Large-Scale Optical [Member]
Sales and operating income data
Net sales	20,028	20,219
Operating income (loss)	4,652	4,870
Intersegment eliminations [Member]
Sales and operating income data
Net sales	(9,460)	(8,984)
Corporate and other [Member]
Sales and operating income data
Operating income (loss)	$ (1,347)	$ (1,132)