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Earnings Per Common Share (Details)
3 Months Ended 6 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2012
Nov. 30, 2011
Reconciliation of the weighted-average number of common shares        
Basic 34,827,000 25,190,000 34,765,000 25,107,000
Effect of dilutive securities 484 150 514 171
Diluted 35,311,000 25,340,000 35,279,000 25,278,000