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Fair Value of Notes Based on Inputs Observable in Market (Level 2) and Carrying Value of Debt Instruments (Detail) - USD ($)
$ in Thousands
May 31, 2017
Feb. 28, 2017
[1]
Debt Instrument [Line Items]    
Carrying value, convertible notes $ 751,173 $ 745,633
Fair Value, Inputs, Level 2    
Debt Instrument [Line Items]    
Fair value, convertible notes $ 767,756  
[1] Derived from audited financial statements.