Goodwill and Other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	May. 30, 2015	Feb. 28, 2015
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	$ 75,857	$ 78,021
Foreign currency translation	(294)	(2,164)
Goodwill, Ending	75,563	75,857
Architectural Glass [Member]
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	26,355	26,628
Foreign currency translation	(358)	(273)
Goodwill, Ending	25,997	26,355
Architectural Services segment [Member]
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	1,120	1,120
Foreign currency translation	0	0
Goodwill, Ending	1,120	1,120
Architectural Framing Systems Segment [Member]
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	37,825	39,716
Foreign currency translation	64	(1,891)
Goodwill, Ending	37,889	37,825
Large-Scale Optical [Member]
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	10,557	10,557
Foreign currency translation	0	0
Goodwill, Ending	$ 10,557	$ 10,557