Employee Benefit Plans - Amortization Schedule (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				12 Months Ended		12 Months Ended
	Jun. 30, 2014 Retiree Medical Plan	Jun. 30, 2013 Retiree Medical Plan	Jun. 30, 2014 Other Postretirement Benefit Plans, Defined Benefit Plan Established January 1, 2008 [Member]	Jun. 30, 2012 Other Postretirement Benefit Plans, Defined Benefit Plan Established January 1, 2008 [Member]	Jun. 30, 2014 Other Postretirement Benefit Plans, Defined Benefit Plan Established July 1, 2012 [Member]	Jun. 30, 2012 Other Postretirement Benefit Plans, Defined Benefit Plan Established July 1, 2012 [Member]	Jun. 30, 2014 Death Benefit Plan	Jun. 30, 2013 Death Benefit Plan
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit) [Roll Forward]
Net Prior Service Cost (Credit), beginning of period		$ (17,477)		$ (1,423)		$ (16,054)
Annual Amortization	1,757		230		1,527
Years Remaining			6 years 2 months 12 days		10 years 6 months
Curtailment			0		0
Net Prior Service Cost (Credit), end of period	(15,720)		(1,193)	(1,423)	(14,527)	(16,054)
Amortization of Net (Gain) Loss Calculation
Net (gain) loss	(8,006)	(12,087)					1,791	1,850
Asset (gains)/losses not yet recognized in market related value of assets	0	0					0	0
Net (gain) loss subject to amortization	(8,006)	(12,087)					1,791	1,850
Corridor (10% of greater of APBO or assets)	1,262	872					(826)	(798)
Net (gain)/loss in excess of corridor	$ (6,744)	$ (11,215)					$ 965	$ 1,052
Amortization years	10 years 8 months 0 days	11 years 1 month 3 days					7 years 4 months 24 days	8 years 0 months 15 days