CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Cash flows from operating activities:
Net income (loss)	$ 89,918	$ 652	$ 12,132
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,774	24,179	27,334
Provision for (recovery of) doubtful accounts	71	(8)	80
Restructuring and other transition expenses, net of payments	(2,697)	6,608	0
Deferred income taxes	(80,314)	123	137
Net (gains) losses from sales of assets	(8,405)	394	(3,814)
ESOP and share-based compensation expense	4,342	5,691	4,692
Net losses (gains) on derivative instruments and investments	12,910	(950)	(4,276)
Change in operating assets and liabilities:
Restricted cash	1,002	(1,002)	8,084
Purchases of trading securities held for investment	(7,255)	(3,661)	(5,915)
Proceeds from sales of trading securities held for investment	5,901	2,358	4,290
Accounts and notes receivable	(3,476)	2,078	2,248
Inventories	3,608	20,470	(14,439)
Income tax receivable	288	(307)	181
Derivative (liabilities) assets, net	(10,583)	(7,269)	3,932
Prepaid expenses and other assets	(111)	(1,332)	(661)
Accounts payable	(3,343)	(16,841)	17,526
Accrued payroll expenses and other current liabilities	5,829	(4,606)	2,574
Accrued postretirement benefits	(358)	(1,507)	(1,905)
Other long-term liabilities	(473)	1,860	695
Net cash provided by operating activities	27,628	26,930	52,895
Cash flows from investing activities:
Acquisition of business, net of cash acquired	0	(1,200)	0
Purchases of property, plant and equipment	(31,050)	(19,216)	(25,267)
Purchases of construction-in-progress assets under New Facility lease	(19,426)	0	0
Proceeds from sales of property, plant and equipment	10,946	273	4,536
Net cash used in investing activities	(39,530)	(20,143)	(20,731)
Cash flows from financing activities:
Proceeds from revolving credit facility	405	63,376	44,806
Repayments on revolving credit facility	(374)	(63,947)	(65,454)
Proceeds from New Facility lease financing	19,426	0	0
Payments of capital lease obligations	(3,147)	(3,910)	(3,681)
Payment of financing costs	(8)	(571)	0
Proceeds from stock option exercises	1,694	1,548	1,480
Tax withholding payment - net share settlement of equity awards	(159)	(116)	0
Net cash provided by (used in) financing activities	17,837	(3,620)	(22,849)
Net increase in cash and cash equivalents	5,935	3,167	9,315
Cash and cash equivalents at beginning of year	15,160	11,993	2,678
Cash and cash equivalents at end of year	21,095	15,160	11,993
Supplemental disclosure of cash flow information:
Cash paid for interest	425	769	1,258
Cash paid for income taxes	324	858	361
Supplemental disclosure of non-cash investing activities:
Equipment acquired under capital leases	0	55	1,217
Net change in derivative assets and liabilities included in other comprehensive income (loss), net of tax	8,249	(18,506)	17,524
Construction-in-progress assets under New Facility lease	8,684	0	0
New Facility lease obligation	8,684	0	0
Non-cash additions to equipment	441	51	142
Asset held for sale	7,179	0	0
Non-cash portion of earnout recognized	$ 496	$ 0	$ 0