Debt Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014
Debt Instrument [Line Items]
Capital leases - long term	$ 1,012		$ 7,757
Current maturities of long-term debt	812		4,028
Capital leases - short term	6,435		$ 1,379
Revolving Credit Facility, Current Borrowing Capacity	300,000
Revolving Credit Facility, Maximum Borrowing Capacity	$ 600,000
Revolving Credit Facility, Expiration Date	Feb. 20, 2020
Interest Paid	$ 817	$ 586
Capital Expenditures Incurred but Not yet Paid	$ 5,444	$ 16,084
Credit Facility Points Above Federal Funds Rate [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	0.50%
Credit Facility Points Above Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	1.00%
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 812
Unsecured Debt [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	1.00%
Unsecured Loan, Issuance Date	Mar. 03, 2014
Unsecured Loan, Unused Borrowing Capacity	$ 5,000
Unsecured Loan, Maturity Date	Apr. 30, 2017
Unsecured Loan, Amount Outstanding	$ 0