Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	Aug. 24, 2012	Feb. 24, 2012
Components of accounts receivable [Abstract]
Accounts receivable, gross	$ 6,827	$ 11,095
Less: allowance for doubtful accounts	(400)	(400)
Accounts receivable, net	6,427	10,695
U.S. Government [Member]
Components of accounts receivable [Abstract]
Accounts receivable, gross	3,045	4,305
U.S. Commercial [Member]
Components of accounts receivable [Abstract]
Accounts receivable, gross	1,123	2,994
International [Member]
Components of accounts receivable [Abstract]
Accounts receivable, gross	$ 2,659	$ 3,797