Commitments and Contingencies - Contractual Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Capital Lease Obligations
2019	$ 202
2020	52
2021	8
2022	0
2023	0
Thereafter	0
Total minimum lease payments	262
Less: imputed interest (0.82% to 10.66%)	(14)
Capital Lease Obligations	248
Less: current portion	190	$ 958
Long-term obligations under capital leases	58	237
Operating Lease Obligations
2019	4,803
2020	3,069
2021	1,823
2022	1,264
2023	1,070
Thereafter	5,247
Future Minimum Payments Due	17,276
Purchase Option [Abstract]
2019	8,520
2020	0
2021	0
2022	0
2023	0
Thereafter	0
Purchase option, estimated purchase price	8,520
Revolving Credit Facility
2019	89,787	27,621
Purchase Commitments
2019	78,690
2020	0
2021	0
2022	0
2023	0
Thereafter	0
Future minimum purchase commitments	78,690
Other Obligations
2019	0
2020	1,754
2021	0
2022	0
2023	0
Thereafter	0
Other Obligations	1,754
Long-term Purchase Commitment, additional	19,300
Withdrawal obligation	3,800
Multiemployer Plans, Estimated Employer Contributions in Next Fiscal Year	5,100
Business Combination, Contingent Consideration, Liability, Noncurrent	0	1,100
Derivative liabilities—noncurrent	386	380
Cumulative preferred dividends, undeclared and unpaid—noncurrent	312	$ 0
Pension Plan
Defined Benefit Plan Obligations
2019	13,652
2020	8,200
2021	8,440
2022	8,640
2023	8,790
Thereafter	44,410
Future payments due	92,132
Other Postretirement Benefits Plan
Defined Benefit Plan Obligations
2019	5,915
2020	892
2021	973
2022	1,045
2023	1,093
Thereafter	6,374
Future payments due	16,292
Revolving Credit Facility
Revolving Credit Facility
2019	89,787
2020	0
2021	0
2022	0
2023	0
Thereafter	0
Future minimum debt maturities	89,787
Minimum
Capital Lease Obligations
Imputed interest rate on capital leases		0.82%
Maximum
Capital Lease Obligations
Imputed interest rate on capital leases		10.66%
Pension Plans, Single Employer [Member] | Pension Plan
Defined Benefit Plan Obligations
Future payments due	86,700
Pension Plans, Single Employer [Member] | Other Postretirement Benefits Plan
Defined Benefit Plan Obligations
Future payments due	11,200
Multiemployer Plans, Pension
Other Obligations
Multiemployer Plans, Estimated Employer Contributions in Next Fiscal Year	1,700
Multiemployer Plans, Postretirement Benefit | Other Postretirement Benefits Plan
Defined Benefit Plan Obligations
Future payments due	$ 5,100