Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 01, 2012	Mar. 03, 2012
Components of inventories
Raw materials	$ 15,864	$ 12,772
Work-in-process	9,205	7,956
Finished goods	13,046	10,386
Costs and earnings in excess of billings on uncompleted contracts	4,423	2,931
Total inventories	$ 42,538	$ 34,045

Amount included in cost of uncompleted contracts in excess of related billings, or unbilled accounts receivable, which is expected to be collected within a year within one year (or one operating cycle, if longer) from the date of the balance sheet.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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