Commitments and Contingencies - Contractual Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Capital Lease Obligations
2017	$ 1,443
2018	880
2019	125
2020	52
2021	4
Thereafter	0
Total minimum lease payments	2,504
Less: imputed interest (0.82% to 10.7%)	(145)
Present value of future minimum lease payments	2,359
Less: current portion	1,323	$ 3,249
Other long-term liabilities-capital leases	1,036	$ 2,599
Operating Lease Obligations
2017	4,093
2018	3,366
2019	2,561
2020	1,279
2021	441
Thereafter	61
Future Minimum Payments Due	11,801
Purchase Option [Abstract]
2017	58,779
2018	0
2019	0
2020	0
2021	0
Thereafter	0
Purchase option, estimated purchase price	58,779
Purchase Commitments
2017	72,217
2018	0
2019	0
2020	0
2021	0
Thereafter	0
Future minimum purchase commitments	72,217
Pension Plan
Defined Benefit Plan Obligations
2017	8,075
2018	8,304
2019	8,554
2020	8,844
2021	9,074
Thereafter	47,099
Future payments due	89,950
Postretirement Benefits Other Than Pension
Defined Benefit Plan Obligations
2017	1,080
2018	1,102
2019	1,143
2020	1,176
2021	1,210
Thereafter	6,246
Future payments due	11,957
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
2017	109
2018	0
2019	0
2020	0
2021	0
Thereafter	0
Future minimum debt maturities	$ 109