Commitments and Contingencies - Contractual Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014
Capital Lease Obligations
2016	$ 3,464
2017	1,601
2018	898
2019	144
2020	51
Thereafter	4
Total minimum lease payments	6,162
Less: imputed interest (0.82% to 10.7%)	(314)
Present value of future minimum lease payments	5,848
Less: current portion	3,249	$ 3,779
Other long-term liabilities-capital leases	2,599	$ 5,924
Operating Lease Obligations [Abstract]
2016	3,991
2017	2,442
2018	2,090
2019	1,541
2020	563
Thereafter	31
Future Minimum Payments Due	10,658
Purchase Commitments
2016	45,324
2017	0
2018	0
2019	0
2020	0
Thereafter	0
Future minimum purchase commitments	45,324
Pension Plan
Defined Benefit Plan Obligations
2016	7,590
2017	7,828
2018	8,137
2019	8,407
2020	8,687
Thereafter	47,033
Future payments due	87,682
Postretirement Benefits Other Than Pension
Defined Benefit Plan Obligations
2016	1,076
2017	1,171
2018	1,306
2019	1,480
2020	1,555
Thereafter	8,950
Future payments due	15,538
Minimum
Capital Lease Obligations
Imputed interest rate on capital leases		0.82%
Maximum
Capital Lease Obligations
Imputed interest rate on capital leases		10.70%
Revolving Credit Facility
Revolving Credit Facility
2016	78
2017	0
2018	0
2019	0
2020	0
Thereafter	0
Future minimum debt maturities	$ 78