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Retirement Plans (Schedule Of Financial Security Plan Benefit Expense Charged To Costs And Expenses) (Details) (Financial Security Defined Benefit Plans [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Nov. 30, 2011
Nov. 30, 2010
Financial Security Defined Benefit Plans [Member]
       
Service cost $ 537 $ 550 $ 1,074 $ 1,100
Interest cost 629 578 1,258 1,156
Defined benefit pension plan, total $ 1,166 $ 1,128 $ 2,332 $ 2,256