Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 01, 2018	Dec. 02, 2017	Dec. 01, 2018	Dec. 02, 2017
Sales and operating income data
Net sales	$ 357,718	$ 356,506	$ 1,056,382	$ 972,721
Operating income (loss)	31,408	34,535	82,062	86,415
Architectural Glass
Sales and operating income data
Net sales	98,524	96,940	263,533	292,026
Operating income (loss)	5,851	9,107	9,168	28,687
Architectural Services
Sales and operating income data
Net sales	72,828	49,077	220,051	146,056
Operating income (loss)	8,659	2,547	21,435	4,102
Architectural Framing Systems
Sales and operating income data
Net sales	181,306	194,157	550,193	493,672
Operating income (loss)	12,903	18,452	43,554	46,958
Large-Scale Optical
Sales and operating income data
Net sales	23,377	26,003	64,522	64,897
Operating income (loss)	6,628	6,724	15,845	15,022
Intersegment eliminations
Sales and operating income data
Net sales	(18,317)	(9,671)	(41,917)	(23,930)
Corporate and other
Sales and operating income data
Operating income (loss)	$ (2,633)	$ (2,295)	$ (7,940)	$ (8,354)