Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 28, 2015	Nov. 29, 2014	Nov. 28, 2015	Nov. 29, 2014
Sales and operating income data
Net sales	$ 238,324	$ 244,410	$ 719,040	$ 687,238
Operating income (loss)	27,858	20,625	68,505	43,938
Architectural Glass [Member]
Sales and operating income data
Net sales	85,461	90,268	279,069	254,138
Operating income (loss)	8,383	5,836	23,405	11,935
Architectural Services segment [Member]
Sales and operating income data
Net sales	61,244	56,178	169,093	167,146
Operating income (loss)	3,702	323	6,063	2,279
Architectural Framing Systems Segment [Member]
Sales and operating income data
Net sales	76,419	80,411	228,990	221,369
Operating income (loss)	9,244	7,596	24,197	16,974
Large-Scale Optical [Member]
Sales and operating income data
Net sales	24,211	25,546	66,874	64,969
Operating income (loss)	7,621	7,879	18,132	15,990
Intersegment eliminations [Member]
Sales and operating income data
Net sales	(9,011)	(7,993)	(24,986)	(20,384)
Corporate and other [Member]
Sales and operating income data
Operating income (loss)	$ (1,092)	$ (1,009)	$ (3,292)	$ (3,240)