Pension and Postretirement Benefit Plans (Assumptions) (Details) (USD $)	12 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Effect of One-Percentage Point Change in Assumed HealthCare Cost Trend Rates [Abstract]
Effect of one percentage point increase on service and interest cost components	68,000
Effect of one percentage point decrease on service and interest cost components	(37,000)
Effect of one percentage point increase on postretirement benefit obligation	864,000
Effect of one percentage point decrease on postretirement benefit obligation	(712,000)
Pension Plans [Member] \| Benefit Obligation [Member]
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.50%	4.65%
Pension Plans [Member] \| Benefit Obligation [Member] \| Year One [Member]
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	3.50%	4.50%
Pension Plans [Member] \| Benefit Obligation [Member] \| Subsequent Years [Member]
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	3.50%	4.50%
Pension Plans [Member] \| Net Periodic Benefit Cost [Member]
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.65%	4.50%	5.75%
Expected return on plan assets	8.00%	8.25%	8.25%
Pension Plans [Member] \| Net Periodic Benefit Cost [Member] \| Year One [Member]
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	4.50%	4.50%	0.00%
Pension Plans [Member] \| Net Periodic Benefit Cost [Member] \| Subsequent Years [Member]
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	4.50%	4.50%	4.50%
Nonbargaining Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension contribution made to the trust			9,500,000
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate			5.25%
Postretirement [Member] \| Benefit Obligation [Member]
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.10%	5.25%
Rate of increase in health care cost [Abstract]
Initial level	8.00%	8.50%
Ultimate level	5.00%	5.00%
Years to ultimate level	6 years	7 years
Postretirement [Member] \| Benefit Obligation [Member] \| Year One [Member]
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	3.50%	4.50%
Postretirement [Member] \| Benefit Obligation [Member] \| Subsequent Years [Member]
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	3.50%	4.50%
Postretirement [Member] \| Net Periodic Benefit Cost [Member]
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	5.25%	5.00%	6.20%
Rate of increase in health care cost [Abstract]
Initial level	8.50%	9.00%	7.50%
Ultimate level	5.00%	5.00%	5.00%
Years to ultimate level	7 years	8 years	5 years
Postretirement [Member] \| Net Periodic Benefit Cost [Member] \| Year One [Member]
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	4.50%	4.50%	0.00%
Postretirement [Member] \| Net Periodic Benefit Cost [Member] \| Subsequent Years [Member]
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	4.50%	4.50%	4.50%

Defined Benefit Plan Years Projected For Rate To Reach Ultimate Trend Rate

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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph j

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(1)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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- Definition

The interest rate used to adjust for the time value of money.

+ References

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 87

-Paragraph 264

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph j

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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- Definition

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ References

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- Definition

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ References

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- Definition

The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ References

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- Definition

The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ References

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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

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- Definition

The ultimate trend rate for health care costs.

+ References

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- Definition

The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

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