Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Net income (loss)	$ 36,604	$ 46,545	$ 52,056
Other comprehensive income (loss):
Actuarial gains (losses) and other changes in unrecognized costs	6,159	3,689	(26,619)
Amortization of unrecognized costs	5,485	5,729	4,779
Change in unrealized gains and (losses)	2,541	(2,896)	(1,010)
Foreign currency translation gains (losses)	93	(472)	(11,303)
Other comprehensive income (loss) before tax	14,570	5,663	(33,474)
Actuarial gains (losses) and other changes in unrecognized costs	(1,436)	(1,354)	10,075
Amortization of unrecognized costs	(1,460)	(2,012)	(1,685)
Change in unrealized gains and (losses)	(339)	(80)	384
Income tax (provision) benefit to other comprehensive income (loss)	(3,278)	(3,626)	8,516
Other comprehensive income (loss), net of tax	11,292	2,037	(24,958)
Comprehensive income (loss)	47,896	48,582	27,098
Interest Expense [Member]
Other comprehensive income (loss):
Amortization of unrealized gains and (losses)	292	(462)	567
Amortization of unrealized gains and (losses)	(43)	(152)	(216)
Cost of Sales [Member]
Other comprehensive income (loss):
Amortization of unrealized gains and (losses)		75	112
Amortization of unrealized gains and (losses)		$ (28)	$ (42)