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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Beginning Balance $ 1,226,154   $ 1,052,653 $ 995,801
Net income 53,111 $ 39,654 134,907 26,368
Other comprehensive income (loss) 19,992 14,387 55,041 (15,898)
Dividend reinvestment     163 188
Capital stock issued under employee benefit and stock plans     33,555 21,385
Purchase of capital stock     (163) (188)
Cash dividends     (50,002) (48,085)
Ending Balance 1,226,154 979,571 1,226,154 979,571
Capital stock [Member]        
Beginning Balance     100,832 99,618
Dividend reinvestment     5 7
Capital stock issued under employee benefit and stock plans     1,200 697
Purchase of capital stock     (5) (7)
Ending Balance 102,032 100,315 102,032 100,315
Additional paid-in capital [Member]        
Beginning Balance     474,547 436,617
Dividend reinvestment     158 181
Capital stock issued under employee benefit and stock plans     32,355 20,688
Purchase of capital stock     (158) (181)
Ending Balance 506,902 457,305 506,902 457,305
Retained earnings [Member]        
Beginning Balance     765,607 780,597
Net income     131,651 24,495
Cash dividends     (48,773) (48,013)
Ending Balance 848,485 757,079 848,485 757,079
Accumulated other comprehensive loss [Member]        
Beginning Balance     (323,692) (352,509)
Other comprehensive income (loss)     53,598 (16,228)
Ending Balance (270,094) (368,737) (270,094) (368,737)
Non-controlling interest [Member]        
Beginning Balance     35,359 31,478
Net income     3,256 1,873
Other comprehensive income (loss)     1,443 330
Cash dividends     (1,229) (72)
Ending Balance $ 38,829 $ 33,609 $ 38,829 $ 33,609