Summary of Significant Accounting Policies (Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014		Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (8,256)		$ (11,954)		$ (8,391)		$ (12,162)
Total other comprehensive income, before tax	108		165		322		497
Total tax expense	(40)		(61)		(119)		(185)
Other comprehensive income, net of tax	68		104		203		312
Accumulated other comprehensive loss at end of period	(8,188)		(11,850)		(8,188)		(11,850)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of unrecognized net (gain) loss	115	[1]	172	[1]	345	[1]	516	[1]
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of unrecognized net (gain) loss	(6)	[1]	(6)	[1]	(20)	[1]	(16)	[1]
Amortization of prior service asset	$ (1)	[1]	$ (1)	[1]	$ (3)	[1]	$ (3)	[1]

[1] Included in the computation of net periodic benefit income/cost. See Notes 8 and 9 for additional information.