Goodwill and Other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 03, 2017	Mar. 04, 2017
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	$ 101,334	$ 73,996
Goodwill acquired		27,444
Goodwill adjustment for purchase accounting	(5,860)
Foreign currency translation	(263)	(106)
Goodwill, Ending	95,211	101,334
Architectural Glass
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	25,956	25,639
Goodwill acquired		0
Goodwill adjustment for purchase accounting	0
Foreign currency translation	50	317
Goodwill, Ending	26,006	25,956
Architectural Framing Systems
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	63,701	36,680
Goodwill acquired		27,444
Goodwill adjustment for purchase accounting	(5,860)
Foreign currency translation	(313)	(423)
Goodwill, Ending	57,528	63,701
Architectural Services
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	1,120	1,120
Goodwill acquired		0
Goodwill adjustment for purchase accounting	0
Foreign currency translation	0	0
Goodwill, Ending	1,120	1,120
Large-Scale Optical
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	10,557	10,557
Goodwill acquired		0
Goodwill adjustment for purchase accounting	0
Foreign currency translation	0	0
Goodwill, Ending	$ 10,557	$ 10,557