Inventories (Details) - USD ($) $ in Thousands	May. 30, 2015	Feb. 28, 2015
Components of inventories
Raw materials	$ 21,582	$ 19,761
Work-in-process	13,576	14,385
Finished goods	24,199	23,076
Costs and earnings in excess of billings on uncompleted contracts	3,133	4,186
Total inventories	$ 62,490	$ 61,408