Basis of Presentation and Significant Accounting Policies Debt Issuance Cost Reclassification (Details) - Accounting Standards Update 2015-03 - USD ($) $ in Thousands	Mar. 31, 2016	Jun. 30, 2015
Long-term Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs	$ 9,875	$ 11,272
Other Deferred Charges
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs	$ (9,875)	$ (11,272)

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_UnamortizedDebtIssuanceExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant