Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 33,937	$ 136,791	$ 113,541
Other comprehensive income (loss), net of income taxes
Pension and other postretirement benefit plans activity	(12,752)	(2,591)	7,583
Unrealized loss on interest rate swaps	(3,101)	(1,299)	0
Other comprehensive income (loss), net of income taxes	(15,853)	(3,890)	7,583
Comprehensive income	$ 18,084	$ 132,901	$ 121,124