Retirement Plans (Details 13)	12 Months Ended
May 31, 2011
Defined Benefit Plan Assumed Health Care Cost Trend Rates Abstract
Defined Benefit Plan Health Care Cost Trend Rate Assumed For Next Fiscal Year	8.30%
Defined Benefit Plan Ultimate Health Care Cost Trend Rate	4.50%
Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate	2029
Defined Benefit Plan Dental Care Cost Trend Rate Assumed For Next Fiscal Year	7.00%
Defined Benefit Plan Ultimate Dental Care Cost Trend Rate	4.50%
Defined Benefit Plan Year That Dental Care Rate Reaches Ultimate Trend Rate	2029
Defined Benefit Plan Effect Of One Percentage Point Change On Accumulated Postretirement Benefit Obligation	Not significant

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of dental care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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- Definition

The effect of a one-percentage-point change in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. (For purposes of this disclosure, all other assumptions shall be held constant, and the effects shall be measured based on the substantive plan that is the basis for the accounting.)

+ Details

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- Definition

The ultimate trend rate for dental care costs.

+ Details

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- Definition

The year when the ultimate dental care cost trend rate is expected to be reached.

+ Details

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- Details

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph l

+ Details

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- Definition

The ultimate trend rate for health care costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph l

+ Details

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- Definition

The year when the ultimate health care cost trend rate is expected to be reached.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph l

+ Details

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