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INCOME TAXES - Effective income tax rate (Details) | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Effective income tax rate |  |  |
Provision for income taxes at federal statutory rate (as a percent) | 21.00% | 21.00% | 21.00%
Research and development tax credits (as a percent) | (1.70%) | (1.60%) | (1.60%)
Foreign income subject to tax at other than federal statutory rate (as a percent) | 0.60% | (0.80%) | 2.90%
Stock compensation (as a percent) | (0.90%) | (6.70%) | (3.20%)
Officers' compensation (as a percent) | 5.80% | 4.40% | 3.50%
Change in valuation allowance (as a percent) | (5.90%) | (1.30%) | (1.80%)
Unrecognized tax expense (as a percent) | 4.20% | 1.20% | 0.10%
Tax on foreign currency gains and losses (as a percent) | (0.20%) | 2.10% | 0.20%
State tax expense (as a percent) | 1.20% | 1.10% | 1.60%
U.S. tax on foreign earnings (as a percent) | (1.80%) | (2.10%) | 1.00%
Changes in prior year estimates (as a percent) |  | (6.40%) |
Global intangible low-taxed income, net of foreign tax credits (as a percent) | 0.50% | 1.80% | 1.00%
Foreign Derived Intangible Income Benefit | (1.30%) | (0.60%) | (0.40%)
Withholding tax on foreign earnings (as a percent) | 3.40% |  |
Other (as a percent) |  | 0.50% | 0.50%
Effective income tax rate (as a percent) | 24.90% | 12.60% | 24.80%

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