Borrowings from Secured and Unsecured Debt Financings - Narrative (Details)			3 Months Ended		6 Months Ended
	May 12, 2025 USD ($) aircraft	Apr. 28, 2025 USD ($)	Aug. 31, 2025 USD ($)	Aug. 31, 2024 USD ($)	Aug. 31, 2025 USD ($)	Aug. 31, 2024 USD ($)	Jul. 17, 2025 USD ($)	Feb. 28, 2025 USD ($)
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt			$ 0	$ 285,000	$ (2,973,000)	$ 285,000
Borrowings from unsecured financings, net			5,133,849,000		5,133,849,000			$ 4,452,781,000
Remaining borrowing capacity			1,900,000,000		1,900,000,000
6.500% Senior Notes due 2028 | Senior Notes | 6.50%
Debt Instrument [Line Items]
Borrowings from unsecured financings, net			$ 650,000,000		$ 650,000,000			650,000,000
Interest rate			6.50%		6.50%
5.75% | Senior Notes | 5.75%
Debt Instrument [Line Items]
Interest rate			5.75%		5.75%
5.25% | Senior Notes | Senior Notes due 2025(2)
Debt Instrument [Line Items]
Interest rate			5.25%		5.25%
5.25% | Senior Notes | Senior Notes Due 2030
Debt Instrument [Line Items]
Interest rate			5.25%		5.25%
4.25% | Senior Notes | Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate			4.25%		4.25%
2.85% | Senior Notes | 2.850% Senior Notes due 2028
Debt Instrument [Line Items]
Interest rate			2.85%		2.85%
6.50% | Senior Notes | 6.500% Senior Notes due 2028
Debt Instrument [Line Items]
Interest rate			6.50%		6.50%
5.95% | Senior Notes | Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate			5.95%		5.95%
2025 Unsecured Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 600,000,000.0	$ 600,000,000		$ 600,000,000			0
Debt instrument, basis spread on variable rate		1.40%
Debt Instrument, Maximum Borrowing Capacity		$ 700,000,000.0
Debt instrument, covenant, interest coverage ratio, minimum		2.0
Debt instrument, covenant, unencumbered asset ratio, minimum		1.25
Debt instrument, covenant, net worth, minimum		$ 1,100,000,000
2022 Secured Facility | Secured Debt
Debt Instrument [Line Items]
Maximum number of aircraft secured by debt instrument | aircraft	17
Gain (loss) on extinguishment of debt					3,000,000.0
Repayments of Debt	$ 391,600,000
Prepayment of accrued interest	$ 5,500,000
Individual Debt Instrument | aircraft	1
5.000% Senior Notes Due 2030 | Senior Notes
Debt Instrument [Line Items]
Debt issue price percent							99.306%
5.000% Senior Notes Due 2030 | Senior Notes | 5.000%
Debt Instrument [Line Items]
Borrowings from unsecured financings, net			$ 650,000,000		$ 650,000,000		$ 650,000,000.0	0
Interest rate			5.00%		5.00%
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Borrowings from unsecured financings, net			$ 240,000,000		$ 240,000,000			$ 150,000,000