Concentrations of Risk - Additional Information (Detail) (USD $)	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Concentration Risk [Line Items]
Minimum Insurance available to depositors under the FDIC's general deposit insurance rules	$ 250,000
Cash balances not federally insured	3,700,000
Cash in bank accounts	5,316,000	6,232,000	10,410,000	12,305,000
Canada [Member]
Concentration Risk [Line Items]
Cash in bank accounts	300,000
Mexico [Member]
Concentration Risk [Line Items]
Cash in bank accounts	$ 800,000