Indebtedness - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Nov. 30, 2012
Line of Credit Facility [Line Items]
Credit line with JP Morgan Chase Bank	$ 7.5
Line of credit, expiry date	May 13, 2013
Outstanding letters of credit	1.1
Net amount available for borrowing	$ 3.9
Letter of Credit
Line of Credit Facility [Line Items]
Annual letter of credit fee	1.50%
Annual letter of credit fee on unused credit line	0.25%
Prime Rate
Line of Credit Facility [Line Items]
Line of credit, interest rate	3.25%
LIBOR
Line of Credit Facility [Line Items]
Line of credit, interest rate	1.50%