Postretirement Benefits (One-Percentage-Point Change In Assumed Health Care Cost Trend Rates) (Details) (USD $) In Thousands	12 Months Ended
Jun. 30, 2011
Postretirement Benefits
Effect on total of service and interest cost components, 1-Percentage-Point Increase	$ 9
Effect on total of service and interest cost components, 1-Percentage-Point Decrease	(8)
Effect on postretirement benefit obligation as of June 30, 2011, 1-Percentage-Point Increase	171
Effect on postretirement benefit obligation as of June 30, 2011, 1-Percentage-Point Decrease	$ (149)

The 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 (m)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration