Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits [Member]
Components of net periodic cost:
Service cost	$ 19	$ 20	$ 38	$ 39
Interest cost	295	315	590	630
Expected return on plan assets	(104)	(101)	(208)	(202)
Recognized net actuarial loss (gain)	153	184	306	368
Amortization of prior service cost	19	21	39	42
Net periodic cost	382	439	765	877
Retiree Health Care Benefits [Member]
Components of net periodic cost:
Service cost	12	20	24	40
Interest cost	34	47	69	94
Expected return on plan assets	0	0	0	0
Recognized net actuarial loss (gain)	(10)	(14)	(19)	(27)
Amortization of prior service cost	(67)	27	(135)	54
Net periodic cost	$ (31)	$ 80	$ (61)	$ 161