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INCOME TAXES - Effective income tax rate (Details) | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Effective income tax rate |  |  |
Provision for income taxes at federal statutory rate (as a percent) | 21.00% | 28.10% | 35.00%
Research and development tax credits (as a percent) | (1.60%) | (1.40%) | (2.50%)
Foreign income subject to tax at other than federal statutory rate (as a percent) | 2.90% | (4.80%) | (20.00%)
Stock compensation excess tax benefit (as a percent) | (3.20%) | (8.80%) | (9.50%)
Officers' compensation (as a percent) | 3.50% |  |
Change in valuation allowance (as a percent) | (1.80%) | 19.60% | 10.40%
Unrecognized tax (benefit) expense (as a percent) | 0.10% | (6.80%) | (1.40%)
Meals and entertainment (as a percent) | 0.40% | 1.50% | 1.80%
Tax on foreign currency gains and losses (as a percent) | 0.20% | (0.10%) | 9.10%
State tax expense (as a percent) | 1.60% | (1.30%) | (1.50%)
U.S. tax on foreign earnings (as a percent) | 1.00% | 2.50% | 0.40%
Non-taxable gain from sale of business (as a percent) |  |  | (3.60%)
Mexico imputed income or expense (as a percent) | (0.50%) | (3.50%) | (2.00%)
Remeasurement of U.S. net deferred tax assets from 35% to 21% (as a percent) |  | 16.00% |
Deemed repatriation of non-U.S. earnings |  | 1.022 |
Withholding tax on deemed repatriation foreign earnings (as a percent) |  | 35.80% |
Other (as a percent) | 1.20% |  | 1.90%
Effective income tax rate (as a percent) | 24.80% | 179.00% | 18.10%

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