Acquisition (Details 1) (Alumicor Limited [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 30, 2013	Dec. 01, 2012	Nov. 30, 2013	Dec. 01, 2012
Alumicor Limited [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue	$ 210,613	$ 207,359	$ 595,451	$ 563,579
Business Acquisition, Pro Forma Net Income (Loss)	$ 10,595	$ 10,028	$ 22,516	$ 18,439
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 0.37	$ 0.36	$ 0.79	$ 0.66
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.36	$ 0.35	$ 0.77	$ 0.65