Income Taxes - Current and Deferred Components of Provision For Income Taxes (Details) (USD $)	3 Months Ended							6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Income Tax Disclosure [Abstract]
Tax Benefit from Gain on Postretirement Benefits, Continuing Operations												$ (1,100,000)	$ 0	$ (14,100,000)
Current:
Federal												(24,000)	(385,000)	(4,000)
State												191,000	115,000	323,000
Total current income tax benefit												167,000	(270,000)	319,000
Deferred:
Federal												(819,000)	(63,000)	(11,373,000)
State												(173,000)	(14,000)	(2,342,000)
Total deferred income tax expense (benefit)												(992,000)	(77,000)	(13,715,000)
Income tax (benefit) expense	$ (40,000)	$ (32,000)	$ 441,000	$ (172,000)	$ (572,000)	$ 59,000	$ 338,000	$ 409,000	$ 397,000	$ 369,000	$ (175,000)	$ (825,000)	$ (347,000)	$ (13,396,000)	$ (2,530,000)