Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Segment Reporting Information [Line Items]
Net Sales	$ 30,387	$ 34,009	$ 95,148	$ 104,462
Percentage of Net Sales	100.00%	100.00%	100.00%	100.00%
Acoustical
Segment Reporting Information [Line Items]
Net Sales	18,909	16,524	58,192	51,390
Percentage of Net Sales	62.00%	49.00%	61.00%	49.00%
Coated
Segment Reporting Information [Line Items]
Net Sales	$ 11,478	$ 17,485	$ 36,956	$ 53,072
Percentage of Net Sales	38.00%	51.00%	39.00%	51.00%