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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 |

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