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Fair Value Measurements (Tables)
 9 Months Ended
Nov. 30, 2021
Fair Value Disclosures [Abstract]  
Fair value assets and liabilities measured on recurring basis
The following tables set forth our financial assets as of November 30, 2021 and February 28, 2021 that we measured at fair value on a recurring basis by level within the fair value hierarchy. Assets measured at fair value are classified in their entirety based on the lowest level of input that is significant to their fair value measurement.
  Fair Value Measurements at November 30, 2021
Using Fair Value Hierarchy
 Fair Value as of November 30,
2021		Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Valuation
Technique
Assets:
Cash and cash equivalents$276,289 $276,289 $— $— Market
Restricted cash and cash equivalents2,740 2,740 — — Market
Total$279,029 $279,029 $— $— 
  Fair Value Measurements at February 28, 2021
Using Fair Value Hierarchy
 Fair Value as of February 28, 2021Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Valuation
Technique
Assets:
Cash and cash equivalents$578,004 $578,004 $— $— Market
Restricted cash and cash equivalents2,594 2,594 — — Market
Total$580,598 $580,598 $— $— 
Carrying amounts and fair values of financial instruments
The carrying amounts and fair values of our financial instruments at November 30, 2021 and February 28, 2021 were as follows:
 November 30, 2021February 28, 2021
 Carrying  Amount
of Liability		Fair Value
of Liability		Carrying
Amount
of Liability		Fair Value
of Liability
Credit Facilities$— $— $— $— 
Unsecured Term Loan215,000 211,728 215,000 210,290 
Export Credit Agency (“ECA”) Financings23,455 24,173 36,423 37,942 
Bank Financings684,436 706,651 738,353 740,086 
Senior Notes3,700,000 3,906,613 4,200,000 4,402,722