Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	Nov. 23, 2012	Feb. 24, 2012
Components of accounts receivable [Abstract]
Accounts receivable, gross	$ 14,777	$ 11,095
Less: allowance for doubtful accounts	(450)	(400)
Accounts receivable, net	14,327	10,695
U.S. Government [Member]
Components of accounts receivable [Abstract]
Accounts receivable, gross	4,467	4,305
U.S. Commercial [Member]
Components of accounts receivable [Abstract]
Accounts receivable, gross	1,237	2,994
International [Member]
Components of accounts receivable [Abstract]
Accounts receivable, gross	$ 9,072	$ 3,797