Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 28, 2020	Nov. 30, 2019	Nov. 28, 2020	Nov. 30, 2019
Sales and operating income data
Net sales	$ 313,583	$ 337,916	$ 922,162	$ 1,050,340
Operating income (loss)	49,750	21,594	79,433	72,210
Architectural Framing Systems
Sales and operating income data
Net sales	136,688	165,517	439,779	533,432
Operating income (loss)	7,218	6,345	26,211	34,141
Architectural Glass
Sales and operating income data
Net sales	84,779	89,433	248,274	288,862
Operating income (loss)	10,825	4,092	15,306	16,951
Architectural Services
Sales and operating income data
Net sales	76,690	69,043	213,911	195,787
Operating income (loss)	8,558	6,533	20,470	15,082
Large-Scale Optical
Sales and operating income data
Net sales	25,267	24,405	48,438	66,449
Operating income (loss)	26,114	6,754	25,131	15,561
Intersegment eliminations
Sales and operating income data
Net sales	(9,841)	(10,482)	(28,240)	(34,190)
Corporate and other
Sales and operating income data
Operating income (loss)	$ (2,965)	$ (2,130)	$ (7,685)	$ (9,525)