Borrowings from Secured and Unsecured Debt Financings (Details) $ in Thousands	Aug. 31, 2023 USD ($) aircraft	Jul. 18, 2023 USD ($)	Apr. 03, 2023 USD ($)	Feb. 28, 2023 USD ($)
Outstanding amounts of secured and unsecured term debt financings
Borrowings from secured financings	$ 913,864			$ 752,298
Borrowings from unsecured financings, net	$ 3,991,875			3,842,454
Number of Aircraft | aircraft	38
Total secured and unsecured debt financings, net of debt issuance costs and discounts	$ 4,905,739			4,594,752
Line of Credit | Revolving Credit Facility
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 20,000			20,000
Line of Credit | Maximum | Revolving Credit Facility
Outstanding amounts of secured and unsecured term debt financings
Interest Rate	7.21%
Bank Financings | Notes Payable to Banks
Outstanding amounts of secured and unsecured term debt financings
Borrowings from secured financings	$ 922,688			761,283
Number of Aircraft | aircraft	38
Bank Financings | Notes Payable to Banks | Minimum
Outstanding amounts of secured and unsecured term debt financings
Interest Rate	2.36%
Bank Financings | Notes Payable to Banks | Maximum
Outstanding amounts of secured and unsecured term debt financings
Interest Rate	7.74%
Bank Financings | Notes Payable, Other Payables
Outstanding amounts of secured and unsecured term debt financings
Weighted-average fixed interest rate	5.46%
Secured Debt
Outstanding amounts of secured and unsecured term debt financings
Number of Aircraft | aircraft	0
Debt issuance costs and discounts	$ (8,824)			(8,985)
5.000% Senior Notes due 2023 | Senior Notes
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net			$ 500,000
Interest Rate			5.00%
5.000% Senior Notes due 2023 | Senior Notes | 5.00
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 0			500,000
Interest Rate	5.00%
4.400% Senior Notes due 2023 | Senior Notes | 4.40%
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 650,000			650,000
Interest Rate	4.40%
Senior Notes due 2024 | Senior Notes | 4.125
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 500,000			500,000
Interest Rate	4.125%
Senior Notes due 2025 | Senior Notes | 5.25%
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 650,000			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
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net		$ 650,000
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			0
Interest Rate	6.50%	6.50%
Unsecured Term Loans | Notes Payable to Banks
Outstanding amounts of secured and unsecured term debt financings
Interest Rate	6.90%
Unsecured Term Loans | Unsecured Term Loans
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net	$ 155,000			155,000
Unsecured Debt
Outstanding amounts of secured and unsecured term debt financings
Debt issuance costs and discounts	$ (33,125)			$ (32,546)