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Restructuring And Other Expense (Narrative) (Details) (USD $)
3 Months Ended
Aug. 31, 2011
Professional fees $ 1,720,000
Severance accrual adjustment 4,918,000
Early Retirement And Severance [Member]
 
Severance accrual adjustment (294,000)
Facility exit and other costs [Member]
 
Post-closure facility exit and other costs were incurred 3,509,000
Severance accrual adjustment $ 5,212,000