Commitments and Contingencies - Contractual Obligations (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Jun. 30, 2015
Capital Lease Obligations
2016	$ 2,516
2017	1,598
2018	898
2019	144
2020	51
Thereafter	4
Operating Lease Obligations
2016	2,217
2017	2,585
2018	2,234
2019	1,573
2020	563
Thereafter	31
Future minimum payments due	9,203
Build-To-Suit Lease Obligations
2016	0
2017	1,860
2018	3,757
2019	3,832
2020	3,909
Thereafter	50,973
Future minimum payments	64,331
Purchase Commitments
2016	45,503
2017	0
2018	0
2019	0
2020	0
Thereafter	0
Purchase commitments	45,503
Total minimum lease payments	5,211
Less: imputed interest (0.82% to 10.7%)	(248)
Present value of future minimum lease payments	4,963
Short-term obligations under capital leases	2,904	$ 3,249
Long-term capital lease obligations	2,059	$ 2,599
Pension Plan [Member]
Expected Future Benefit Payments
Expected Future Benefit Payments, 2016	5,693
Expected Future Benefit Payments, 2017	7,179
Expected Future Benefit Payments, 2018	7,345
Expected Future Benefit Payments, 2019	7,604
Expected Future Benefit Payments, 2020	7,787
Expected Future Benefit Payments, Thereafter	43,653
Expected future benefit payments	79,261
Other Postretirement Benefit Plan [Member]
Expected Future Benefit Payments
Expected Future Benefit Payments, 2016	807
Expected Future Benefit Payments, 2017	1,171
Expected Future Benefit Payments, 2018	1,306
Expected Future Benefit Payments, 2019	1,480
Expected Future Benefit Payments, 2020	1,555
Expected Future Benefit Payments, Thereafter	8,950
Expected future benefit payments	15,269
Revolving Credit Facility
Revolving Credit Facility
2016	154
2017	0
2018	0
2019	0
2020	0
Thereafter	0
Revolving credit facility	$ 154
Minimum [Member]
Purchase Commitments
Imputed interest rate (percent)	0.82%
Maximum [Member]
Purchase Commitments
Imputed interest rate (percent)	10.70%