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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
12 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2011
COMMITMENTS AND CONTINGENCIES.      
Maximum term of non-cancellable leases 10 years    
Rental expense under operating leases $ 32,846,710 $ 26,212,907 $ 15,457,321
Future minimum payments under non-cancellable operating leases      
February 2014 33,000,234    
February 2015 24,952,401    
February 2016 14,766,041    
February 2017 7,780,280    
February 2018 and after 7,679,684    
Total $ 88,178,640