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Convertible Notes - Components of Convertible Notes (Detail) - USD ($)
$ in Thousands
May 31, 2019
Feb. 28, 2019
Liability Component [Abstract]    
Net carrying amount $ 0 $ 231,540
Unsecured Debt | 0.25% Convertible Senior Notes due 2019    
Liability Component [Abstract]    
Principal 190,396 306,552
Less: debt issuance costs (211) (595)
Less: debt discount (1,632) (4,590)
Net carrying amount 188,553 301,367
Equity component [1] $ 22,916 $ 36,897
[1] Recognized in the Consolidated Balance Sheets in Additional paid-in capital.