Debt (Details) (USD $)			6 Months Ended			6 Months Ended
	Aug. 31, 2012	Feb. 29, 2012	Aug. 31, 2012 Line Of Credit [Member]	Aug. 31, 2012 Term Securitizations Debt [Member]	Aug. 31, 2012 Warehouse Facilities [Member]	Aug. 31, 2012 Warehouse Facility One [Member] Warehouse Facilities [Member]	Aug. 31, 2012 Warehouse Facility Two [Member] Warehouse Facilities [Member]	Aug. 31, 2012 Scenario, Previously Reported [Member] Warehouse Facility One [Member] Warehouse Facilities [Member]	Aug. 31, 2012 Maximum [Member] Finance and Capital Lease Obligation [Member]	Aug. 31, 2012 Minimum [Member] Finance and Capital Lease Obligation [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity of credit facility			$ 700,000,000
Revolving credit facility, expiration date			Aug. 01, 2016
Revolving credit facility, amount outstanding			1,100,000
Initial lease terms									20 years	15 years
Finance and capital lease obligations current	15,325,000	14,108,000
Finance and capital lease obligations noncurrent	345,628,000	353,566,000
Debt maturity, end				Dec. 01, 2018
Non-recourse notes payable	5,080,000,000	4,680,000,000			1,070,000,000
Current portion of non-recourse notes payable	171,292,000	174,337,000
Warehouse facilities maximum borrowing capacity					1,600,000,000
Remaining borrowing capacity					534,000,000
Amount of facility expiring						$ 800,000,000	$ 800,000,000	$ 800,000,000
Warehouse facility expiration date						Aug. 01, 2013	Feb. 01, 2013	Aug. 01, 2012
Warehouse facility additional term of facility						364 days