Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net Income	$ 32,954us-gaap_NetIncomeLoss	$ 39,234us-gaap_NetIncomeLoss	$ 55,715us-gaap_NetIncomeLoss	$ 64,035us-gaap_NetIncomeLoss
Defined Benefit Pension and Postretirement Benefit Plans:
Amortization of loss, before tax	100	108	200	216
Amortization of prior service asset, before tax	(1)	(1)	(2)	(2)
Total Other Comprehensive Income, Before Tax	99	107	198	214
Tax Attributes of Items in Other Comprehensive Income:
Amortization of loss, tax	(37)	(39)	(73)	(79)
Amortization of prior service asset, tax	0	0	0	0
Total Tax Expense	(37)	(39)	(73)	(79)
Other Comprehensive Income, Net of Tax	62	68	125	135
Comprehensive Income	$ 33,016us-gaap_ComprehensiveIncomeNetOfTax	$ 39,302us-gaap_ComprehensiveIncomeNetOfTax	$ 55,840us-gaap_ComprehensiveIncomeNetOfTax	$ 64,170us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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