Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 01, 2012	Aug. 27, 2011	Sep. 01, 2012 Segment	Aug. 27, 2011
Segment Reporting Information [Line Items]
Number of Reportable Segments			2
Sales and operating income data
Net sales	$ 175,940	$ 165,557	$ 330,074	$ 318,895
Operating income (loss)	7,553	(2,677)	9,870	(6,105)
Architectural [Member]
Sales and operating income data
Net sales	156,368	149,142	291,245	284,429
Operating income (loss)	3,030	(5,123)	1,140	(12,176)
Large-Scale Optical [Member]
Sales and operating income data
Net sales	19,571	16,415	38,829	34,466
Operating income (loss)	5,196	3,516	10,464	8,148
Intersegment eliminations [Member]
Sales and operating income data
Net sales	1	0	0	0
Corporate and other [Member]
Sales and operating income data
Operating income (loss)	$ (673)	$ (1,070)	$ (1,734)	$ (2,077)