Retirement Plans (Details 2)
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12 Months Ended | ||
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May 31, 2013
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May 31, 2012
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May 31, 2011
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Defined Benefit Plan Assumptions Used In Calculations [Abstract] | |||
Expected long-term rate of return on assets | 8.00% | 8.00% | 8.00% |
Pension Plans [Member]
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Defined Benefit Plan Assumptions Used In Calculations [Abstract] | |||
Discount rate used to determine benefit obligation | 4.79% | 4.44% | 5.76% |
Discount rate used to determine net periodic benefit cost | 4.44% | 5.76% | 6.37% |
Rate of increase in future compensation levels used to determine benefit obligation | 4.54% | 4.62% | 4.58% |
Rate of increase in future compensation levels used to determine net periodic benefit cost | 4.62% | 4.58% | 4.63% |
Expected long-term rate of return on assets | 8.00% | 8.00% | 8.00% |
Postretirement Healthcare Plans [Member]
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Defined Benefit Plan Assumptions Used In Calculations [Abstract] | |||
Discount rate used to determine benefit obligation | 4.91% | 4.55% | 5.67% |
Discount rate used to determine net periodic benefit cost | 4.55% | 5.67% | 6.11% |