CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 24,400	$ 89,918	$ 652
Other comprehensive income (loss), net of tax:
Unrealized (losses) gains on derivative instruments designated as cash flow hedges, net of tax	(2,875)	185	(14,295)
(Gains) losses on derivative instruments designated as cash flow hedges reclassified to cost of goods sold, net of tax	(1,058)	8,064	(4,211)
Change in the funded status of retiree benefit obligations, net of tax	7,466	(11,461)	(14,122)
Total comprehensive income (loss), net of tax	$ 27,933	$ 86,706	$ (31,976)