Debt (Schedule of Funding Vehicles) (Details) - USD ($) $ in Thousands	May 31, 2019	Feb. 28, 2019
Schedule of Funding Vehicles [Line Items]
Non-Recourse Debt	$ 12,893,596	$ 12,535,405
Warehouse Facility One
Schedule of Funding Vehicles [Line Items]
Warehouse Facilities Maximum Borrowing Capacity	1,400,000
Warehouse Facility Three
Schedule of Funding Vehicles [Line Items]
Warehouse Facilities Maximum Borrowing Capacity	150,000
Warehouse Facility Two
Schedule of Funding Vehicles [Line Items]
Warehouse Facilities Maximum Borrowing Capacity	1,950,000
Warehouse Facilities [Member]
Schedule of Funding Vehicles [Line Items]
Warehouse Facilities Maximum Borrowing Capacity	3,500,000
Debt Instrument, Unused Borrowing Capacity, Amount	1,320,000
Non-Recourse Debt	2,180,000
Asset-backed term funding transactions
Schedule of Funding Vehicles [Line Items]
Non-Recourse Debt	$ 10,710,000