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Convertible Notes - Components of Convertible Notes (Detail) - USD ($)
$ in Thousands
Nov. 30, 2017
Feb. 28, 2017
Debt Instrument [Line Items]    
Net carrying amount $ 762,367 $ 745,633 [1]
Unsecured Debt | 0.25% Convertible Senior Notes due 2019    
Debt Instrument [Line Items]    
Principal 804,994 805,000
Less: debt issuance costs (5,395) (7,442)
Less: debt discount (37,232) (51,925)
Net carrying amount 762,367 745,633
Equity component $ 96,890 $ 96,890
[1] Derived from audited financial statements.