CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 12,132	$ (8,462)	$ (26,576)
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on derivative instruments designated as cash flow hedges	18,685	(7,866)	0
Gains on derivative instruments designated as cash flow hedges reclassified to cost of goods sold	(1,161)	(55)	0
Change in the funded status of retiree benefit obligations	(2,802)	10,969	(26,574)
Income tax expense	0	(1,066)	0
Total comprehensive income (loss), net of tax	$ 26,854	$ (6,480)	$ (53,150)