Indebtedness - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended					12 Months Ended
	May 30, 2011	Feb. 28, 2013	Apr. 30, 2010	Feb. 28, 2013 Prime Rate	Feb. 28, 2013 LIBOR	Feb. 28, 2013 Letter of Credit
Line of Credit Facility [Line Items]
Line of credit, interest rate				3.25%	1.50%
Annual letter of credit fee						1.50%
Annual letter of credit fee on unused credit line						0.25%
Credit line with JP Morgan Chase Bank			$ 7.5
Credit line with JP Morgan Chase Bank, minimum availability covenant			2.5
Line of credit, expiry date	May 13, 2013
Outstanding letters of credit		1.1
Net amount available for borrowing		$ 3.9