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INCOME TAXES - Unrecognized tax benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Activity of unrecognized tax benefits |  |  |
Balance at the beginning of the year | $ 11,386 | $ 10,498 |
Additions on tax positions for the current year | 1,764 | 940 |
Additions on tax positions from prior years | 451 | 346 |
Reduction in tax positions from prior year | (291) | (398) |
Balance at the end of the year | $ 13,310 | $ 11,386 | $ 10,498
Recent tax legislation |  |  |
Tax expense recorded in connection with the enactment of the Tax Act and Jobs Act, 2017 |  |  | $ 55,000
U.S. Federal income tax rate (as a percent) | 21.00% | 21.00% | 28.10%
Deferred income tax assets: |  |  |
Tax credit carryforwards | $ 15,277 | $ 14,785 |
Net operating loss carryforwards | 4,241 | 9,331 |
Customer advances | 2,725 | 3,365 |
Allowance for doubtful accounts | 2,927 | 4,287 |
Inventory reserve | 11,999 | 11,503 |
Inventory capitalization | 2,762 | 2,721 |
Accrued liabilities | 4,879 | 5,953 |
Operating lease liabilities | 7,243 |  |
Stock and deferred compensation | 9,911 | 12,737 |
Other assets | 2,178 | 3,157 |
Total deferred income tax assets | 64,142 | 67,839 |
Valuation allowance | (17,371) | (23,377) |
Net deferred income tax assets | 46,771 | 44,462 |
Deferred income tax liabilities: |  |  |
Depreciation | (1,459) | (4,866) |
Amortization of intangible assets | (27,907) | (26,056) |
Withholding tax on unrepatriated foreign earnings | (5,114) | (5,114) |
Operating lease ROU assets | (7,295) |  |
State transition tax | (1,754) | (1,754) |
Convertible debt | (4,432) | (6,443) |
Prepaid expenses | (1,399) | (3,903) |
Other liabilities | (143) | (308) |
Total deferred income tax liabilities | (49,503) | (48,444) |
Net deferred tax liabilities | $ (2,732) | $ (3,982) |

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