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Borrowings (Narrative) (Details) (USD $)
 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Jan. 31, 2012
days
Jan. 31, 2011
Mar. 02, 2012
CLOC Agreement [Member]
Jan. 31, 2012
Senior Notes, 7.875%, Due January 2013 [Member]
Apr. 30, 2011
Senior Notes, 7.875%, Due January 2013 [Member]
Jan. 31, 2011
Senior Notes, 7.875%, Due January 2013 [Member]
Jan. 31, 2012
Maximum [Member]
Jan. 31, 2012
Maximum [Member]
LIBOR [Member]
Jan. 31, 2012
Maximum [Member]
PRIME [Member]
Jan. 31, 2012
Minimum [Member]
Jan. 31, 2012
Minimum [Member]
LIBOR [Member]
Jan. 31, 2012
Minimum [Member]
PRIME [Member]
Debt Instrument [Line Items]                        
Commercial paper $ 230,947,000 $ 632,566,000                    
Senior Notes       599,871,000 599,788,000 599,758,000            
Senior notes, maturity date       Jan. 01, 2013                
Maximum funding by facility 1,700,000,000                      
Expiration date of credit facility July 31, 2013                      
Annual interest rate of facility               2.80% 1.80%   1.30% 0.30%
Amount of minimum equity maintained 650,000,000   500,000,000                  
Reduction of the aggregate outstanding principal amount, maximum 200,000,000                      
Reduction of aggregate outstanding principal period (in days) 30                      
Net worth in compliance with covenants 806,400,000                      
Amount of advanced capacity 284,200,000                      
Line of credit, outstanding amount 25,000,000                      
Remaining funding available 259,200,000                      
Mortgage loans held for investment as collateral $ 372,700,000                      
Percentage of annual facility fee             0.70%     0.20%