Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Tables)

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Commitments and Contingencies (Tables)
3 Months Ended
Aug. 31, 2011
Commitments and Contingencies [Abstract]  
Lines of credit
         
Financial institution   Amount available   Expiration date
 
JP Morgan Chase Bank, N.A.
  $350 million   February 2012
Bank of America, N.A.
  $250 million   February 2012
PNC Bank, National Association
  $150 million   February 2012
Wells Fargo Bank, National Association
  $150 million   February 2012