Retirement Plans (Details 2)
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12 Months Ended | ||
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May 31, 2011
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May 31, 2010
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May 31, 2009
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Pension Plans
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Defined Benefit Plan Assumptions Used In Calculations Abstract | |||
Discount rate used to determine benefit obligation | 5.76% | 6.37% | 7.68% |
Discount rate used to determine net periodic benefit cost | 6.37% | 7.68% | 7.15% |
Rate of increase in future compensation levels used to determine benefit obligation | 4.58% | 4.63% | 4.42% |
Rate of increase in future compensation levels used to determine net periodic benefit cost | 4.63% | 4.42% | 4.49% |
Expected long-term rate of return on assets | 8.00% | 8.00% | 8.50% |
Postretirement Healthcare Plans
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Defined Benefit Plan Assumptions Used In Calculations Abstract | |||
Discount rate used to determine benefit obligation | 5.67% | 6.11% | 7.27% |
Discount rate used to determine net periodic benefit cost | 6.11% | 7.27% | 7.13% |