|
Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended |
|---|---|
|
Aug. 31, 2012
|
|
|
JP Morgan Chase Bank, N.A. [Member]
|
|
| Lines of credit | |
| Amount available | $ 350 |
| Expiration date | Feb. 28, 2013 |
|
Bank of America, N.A. [Member]
|
|
| Lines of credit | |
| Amount available | 250 |
| Expiration date | Feb. 28, 2013 |
|
PNC Bank, National Association [Member]
|
|
| Lines of credit | |
| Amount available | 150 |
| Expiration date | Feb. 28, 2013 |
|
Wells Fargo Bank, National Association [Member]
|
|
| Lines of credit | |
| Amount available | $ 150 |
| Expiration date | Feb. 28, 2013 |