Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2018	Mar. 31, 2021	Mar. 31, 2020
Beginning Balance	$ 1,319,689	$ 1,347,027		$ 1,268,788	$ 1,374,704
Net income	22,985	2,241	$ 3,422	22,375	3,422
Other comprehensive income (loss)	(17,302)	(33,961)		60,343	(39,490)
Dividend reinvestment	50	52		150	157
Capital stock issued under employee benefit and stock plans	8,916	98		19,082	8,385
Purchase of capital stock	(50)	(52)		(150)	(157)
Additions to noncontrolling interest					1,527
Cash dividends	(16,707)	(16,582)		(50,016)	(49,725)
Other				(1,630)
Ending Balance	1,317,581	1,298,823		1,317,581	1,298,823
Capital stock [Member]
Beginning Balance	104,330	103,618		103,654	103,026
Dividend reinvestment	2	2		6	6
Capital stock issued under employee benefit and stock plans	148	24		824	616
Purchase of capital stock	(2)	(2)		(6)	(6)
Ending Balance	104,478	103,642		104,478	103,642
Additional paid-in capital [Member]
Beginning Balance	547,754	536,522		538,575	528,827
Dividend reinvestment	48	50		144	151
Capital stock issued under employee benefit and stock plans	8,768	74		18,258	7,769
Purchase of capital stock	(48)	(50)		(144)	(151)
Other				(311)
Ending Balance	556,522	536,596		556,522	536,596
Retained earnings [Member]
Beginning Balance	969,301	1,044,247		1,004,898	1,076,862
Net income	21,621	2,917		19,333	3,445
Cash dividends	(16,707)	(16,582)		(50,016)	(49,725)
Ending Balance	974,215	1,030,582		974,215	1,030,582
Accumulated other comprehensive loss [Member]
Beginning Balance	(342,231)	(378,219)		(417,242)	(373,543)
Other comprehensive income (loss)	(16,572)	(31,978)		58,439	(36,654)
Ending Balance	(358,803)	(410,197)		(358,803)	(410,197)
Non-controlling interest [Member]
Beginning Balance	40,535	40,859		38,903	39,532
Net income	1,364	(676)		3,042	(23)
Other comprehensive income (loss)	(730)	(1,983)		1,904	(2,836)
Additions to noncontrolling interest					1,527
Cash dividends				(1,361)
Other				(1,319)
Ending Balance	$ 41,169	$ 38,200		$ 41,169	$ 38,200