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Summary of Activity for Nonvested Restricted Shares (Detail) (Nonvested Restricted Shares, USD $)
12 Months Ended
May 31, 2012
Nonvested Restricted Shares
 
Weighted average grant-date fair value  
Beginning balance $ 18.04
Granted $ 21.62
Vested $ 14.76
Forfeited $ 20.14
Ending balance $ 19.53
Shares  
Beginning balance 2,520,000
Granted 727,000
Vested (475,000)
Forfeited (14,000)
Ending balance 2,758,000