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CONVERTIBLE SENIOR UNSECURED NOTES (Tables)
3 Months Ended
May 31, 2017
Debt Disclosure [Abstract]  
Schedule of Balances Attributable to the Notes

Balances attributable to the Notes consist of the following (in thousands):

      May 31,       February 28,
2017 2017
Principal $       172,500 $        172,500
Less:  Unamortized debt discount (21,160 ) (22,770 )
Unamortized debt issuance costs (2,697 ) (2,903 )
Net carrying amount of the Notes $ 148,643 $ 146,827