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INCOME TAXES - Excess tax benefits and tax deficiencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Accounting changes      
Income tax benefit $ 65,981 $ 4,675 $ 9,338
Deferred tax asset 2,607 34,897  
Increase to retained earnings   3,808  
ASU 2016-09      
Accounting changes      
Income tax benefit $ 3,700 3,800  
Increase to retained earnings   $ 3,800