Employee Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in OCI (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total accumulated OCI			$ 63,632	$ 60,420
Postretirement Benefits Other Than Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net (gain) loss subject to amortization			7,027	2,965
Transition obligation recognized in AOCI			12,207	13,963
Total accumulated OCI			(19,234)	(16,928)
Unrecognized actuarial loss	$ 4,259	$ (2,751)	4,259	(2,751)
Amortization of net gain (loss)			196	500
Amortization of prior service cost			(1,757)	(1,757)
Total recognized in OCI			(2,306)	5,008
Defined Benefit Plan, Net Periodic Benefit Cost			629	(119)	$ (891)
Total recognized in net periodic benefit cost and OCI			$ (1,677)	$ 4,889