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INCOME TAXES - Unrecognized tax benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Activity of unrecognized tax benefits |  |  |
Balance at the beginning of the year | $ 10,498 | $ 11,195 |
Additions on tax positions for the current year | 940 | 294 |
Additions on tax positions from prior years | 346 | 14 |
Reduction in tax positions from prior year | (398) | (1,005) |
Balance at the end of the year | $ 11,386 | $ 10,498 | $ 11,195
Recent tax legislation |  |  |
U.S. federal statutory tax rate (as a percent) | 21.00% | 28.10% | 35.00%
Deferred income tax assets: |  |  |
Tax credit carryforwards | $ 14,785 | $ 17,591 |
Net operating loss carryforwards | 9,331 | 10,473 |
Customer advances | 3,365 | 2,360 |
Allowance for doubtful accounts | 4,287 | 4,336 |
Inventory reserve | 11,503 | 11,735 |
Inventory capitalization | 2,721 | 3,043 |
Accrued liabilities | 5,953 | 9,174 |
Stock and deferred compensation | 12,737 | 15,779 |
Other assets | 3,157 | 3,641 |
Total deferred income tax assets | 67,839 | 78,132 |
Valuation allowance | (23,377) | (27,007) |
Net deferred income tax assets | 44,462 | 51,125 |
Deferred income tax liabilities: |  |  |
Depreciation | (4,866) | (6,322) |
Amortization of intangible assets | (26,056) | (31,993) |
Withholding tax on unrepatriated foreign earnings | (5,114) | (5,114) |
State transition tax | (1,754) | (1,754) |
Convertible debt | (6,443) | (9,198) |
Prepaid expenses | (3,903) | (8,680) |
Other liabilities | (308) | (459) |
Total deferred income tax liabilities | (48,444) | (63,520) |
Net deferred tax liabilities | (3,982) | (12,395) |
Components of net deferred income tax asset |  |  |
Long term deferred income tax asset, included in other assets | 3,997 | 2,607 |
Long term deferred income tax liability | (7,979) | (15,002) |
Net deferred tax liabilities | (3,982) | (12,395) |
Components of current taxes receivable and payable and prepaid taxes |  |  |
Current taxes receivable and prepaid taxes, included in prepaid expenses and other current assets | 4,344 | 5,172 |
Current taxes payable, included in other accrued expenses and current liabilities | (3,094) | (8,314) |
Net tax receivable | $ 1,250 |  |
Net tax payable |  | $ (3,142) |

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