Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net (Loss) Income	$ (10,376)	$ 21,833	$ 53,659	$ 83,772
Defined Benefit Pension and Postretirement Benefit Plans:
Amortization of loss, before tax	109	166	325	500
Amortization of prior service asset, before tax	(1)	(1)	(3)	(3)
Total Other Comprehensive Income, Before Tax	108	165	322	497
Tax Attributes of Items in Other Comprehensive Income:
Amortization of loss, tax	(41)	(62)	(120)	(186)
Amortization of prior service asset, tax	1	1	1	1
Total Tax Expense	(40)	(61)	(119)	(185)
Other comprehensive income, net of tax	68	104	203	312
Comprehensive (Loss) Income	$ (10,308)	$ 21,937	$ 53,862	$ 84,084