Inventories (Details) - USD ($) $ in Thousands	Aug. 29, 2015	Feb. 28, 2015
Components of inventories
Raw materials	$ 19,266	$ 19,761
Work-in-process	12,861	14,385
Finished goods	22,561	23,076
Costs and earnings in excess of billings on uncompleted contracts	4,988	4,186
Total inventories	$ 59,676	$ 61,408