Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 20,403	$ (10,376)	$ 76,118	$ 53,659
Defined Benefit Pension and Postretirement Benefit Plans:
Amortization of loss, before tax	100	109	300	325
Amortization of prior service asset, before tax	(1)	(1)	(3)	(3)
Total Other Comprehensive Income, Before Tax	99	108	297	322
Tax Attributes of Items in Other Comprehensive Income:
Amortization of loss, tax	(38)	(41)	(111)	(120)
Amortization of prior service asset, tax	1	1	1	1
Total Tax Expense	(37)	(40)	(110)	(119)
Other Comprehensive Income, Net of Tax	62	68	187	203
Comprehensive Income (Loss)	$ 20,465	$ (10,308)	$ 76,305	$ 53,862