Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning balance	$ (8,758)	$ (16,341)	$ (23,115)
Current-year adjustments, pretax	(6,315)	12,310	10,997
Tax expense	2,425	(4,727)	(4,223)
Other comprehensive income (loss), net of income taxes	(3,890)	7,583	6,774
Accumulated other comprehensive loss, ending balance	(12,648)	(8,758)	(16,341)
Minimum Pension/Post Retirement Liability Adjustments [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning balance	(8,758)	(16,341)	(23,115)
Current-year adjustments, pretax	(4,206)	12,310	10,997
Tax expense	1,615	(4,727)	(4,223)
Other comprehensive income (loss), net of income taxes	(2,591)	7,583	6,774
Accumulated other comprehensive loss, ending balance	(11,349)	(8,758)	$ (16,341)
Interest Rate Swaps [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning balance	0
Current-year adjustments, pretax	(2,109)
Tax expense	810
Other comprehensive income (loss), net of income taxes	(1,299)
Accumulated other comprehensive loss, ending balance	$ (1,299)	$ 0