Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) - Line of Credit [Member]
$ in Millions
 3 Months Ended
Aug. 31, 2015
USD ($)
JP Morgan Chase Bank, N.A. [Member]  
Lines of credit  
Amount available $ 350
Expiration date Feb. 28, 2016
Bank of America, N.A. [Member]  
Lines of credit  
Amount available $ 250
Expiration date Feb. 28, 2016
PNC Bank, National Association [Member]  
Lines of credit  
Amount available $ 150
Expiration date Feb. 28, 2016
Wells Fargo Bank, National Association [Member]  
Lines of credit  
Amount available $ 150
Expiration date Feb. 28, 2016