Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 26, 2016	Nov. 28, 2015	Nov. 26, 2016	Nov. 28, 2015
Sales and operating income data
Net sales	$ 274,072	$ 238,324	$ 800,407	$ 719,040
Operating income (loss)	33,259	27,858	92,557	68,505
Architectural Glass [Member]
Sales and operating income data
Net sales	107,002	85,461	299,567	279,069
Operating income (loss)	11,708	8,383	30,855	23,405
Architectural Services segment [Member]
Sales and operating income data
Net sales	64,380	61,244	204,934	169,093
Operating income (loss)	4,918	3,702	14,336	6,063
Architectural Framing Systems Segment [Member]
Sales and operating income data
Net sales	90,850	76,419	264,212	228,990
Operating income (loss)	11,838	9,244	35,070	24,197
Large-Scale Optical [Member]
Sales and operating income data
Net sales	22,084	24,211	63,382	66,874
Operating income (loss)	5,910	7,621	15,613	18,132
Intersegment eliminations [Member]
Sales and operating income data
Net sales	(10,244)	(9,011)	(31,688)	(24,986)
Corporate and other [Member]
Sales and operating income data
Operating income (loss)	$ (1,115)	$ (1,092)	$ (3,317)	$ (3,292)