Borrowings from Secured and Unsecured Debt Financings - Outstanding amounts of secured and unsecured term debt financings (Details) $ in Thousands	Aug. 31, 2025 USD ($) aircraft	Jul. 17, 2025 USD ($)	Feb. 28, 2025 USD ($)
Outstanding amounts of secured and unsecured term debt financings
Borrowings from secured financings	$ 113,863		$ 502,609
Borrowings from unsecured financings, net	$ 5,133,849		4,452,781
Number of Aircraft | aircraft
Total secured and unsecured debt financings, net of debt issuance costs and discounts	$ 5,247,712		4,955,390
Line of Credit | Revolving Credit Facility
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 240,000		150,000
Line of Credit | Minimum | Revolving Credit Facility
Outstanding amounts of secured and unsecured term debt financings
Interest Rate	5.55%
Line of Credit | Maximum | Revolving Credit Facility
Outstanding amounts of secured and unsecured term debt financings
Interest Rate	6.48%
Bank Financings | Notes Payable to Banks
Outstanding amounts of secured and unsecured term debt financings
Borrowings from secured financings	$ 115,840		509,104
Number of Aircraft | aircraft	4
Bank Financings | Notes Payable, Other Payables
Outstanding amounts of secured and unsecured term debt financings
Weighted-average fixed interest rate	3.11%
Bank Financings | Bank Financings | Minimum
Outstanding amounts of secured and unsecured term debt financings
Interest Rate	2.36%
Bank Financings | Bank Financings | Maximum
Outstanding amounts of secured and unsecured term debt financings
Interest Rate	4.14%
Secured Debt
Outstanding amounts of secured and unsecured term debt financings
Debt issuance costs and discounts	$ (1,977)		(6,495)
Senior Notes due 2025(2) | Senior Notes | 5.25%
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 0		650,000
Interest Rate	5.25%
Senior Notes due 2026 | Senior Notes | 4.25%
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 650,000		650,000
Interest Rate	4.25%
2.850% Senior Notes due 2028 | Senior Notes | 2.85%
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 750,000		750,000
Interest Rate	2.85%
6.500% Senior Notes due 2028 | Senior Notes | 6.50%
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 650,000		650,000
Interest Rate	6.50%
Senior Notes due 2029 | Senior Notes | 5.95%
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 650,000		650,000
Interest Rate	5.95%
Senior Notes due 2031 | Senior Notes | 5.75%
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 500,000		500,000
Interest Rate	5.75%
Unsecured Debt
Outstanding amounts of secured and unsecured term debt financings
Debt issuance costs and discounts	$ (56,151)		(47,219)
Senior Notes Due 2030 | Senior Notes | 5.25%
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 500,000		500,000
Interest Rate	5.25%
2025 Unsecured Term Loan | Bank Financings
Outstanding amounts of secured and unsecured term debt financings
Interest Rate	5.72%
5.000% Senior Notes Due 2030 | Senior Notes | 5.000%
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 650,000	$ 650,000	$ 0
Interest Rate	5.00%