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INCOME TAXES - Unrecognized tax benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Activity of unrecognized tax benefits |  |
Balance at the beginning of the year | $ 13,310 | $ 11,386
Additions on tax positions for the current year | 5,937 | 1,764
Additions on tax positions from prior years | 678 | 451
Reduction in tax positions from prior year | (248) | (291)
Balance at the end of the year | 19,677 | 13,310
Deferred income tax assets: |  |
Tax credit carryforwards | 16,767 | 15,277
Net operating loss carryforwards | 3,745 | 4,241
Customer advances | 2,819 | 2,725
Allowance for doubtful accounts | 5,266 | 2,927
Inventory reserve | 10,391 | 11,999
Inventory capitalization | 489 | 2,762
Accrued liabilities | 4,466 | 4,879
Operating lease liabilities | 10,522 | 7,243
Stock and deferred compensation | 12,323 | 9,911
Other assets | 2,685 | 2,178
Total deferred income tax assets | 69,473 | 64,142
Valuation allowance | (16,177) | (17,371)
Net deferred income tax assets | 53,296 | 46,771
Deferred income tax liabilities: |  |
Depreciation | (2,137) | (1,459)
Amortization of intangible assets | (31,779) | (27,907)
Withholding tax on unrepatriated foreign earnings | (6,851) | (5,114)
Operating lease ROU assets | (10,355) | (7,295)
State transition tax | (1,754) | (1,754)
Convertible debt | (2,384) | (4,432)
Prepaid expenses | (929) | (1,399)
Other liabilities | (107) | (143)
Total deferred income tax liabilities | (56,296) | (49,503)
Net deferred tax liabilities | $ (3,000) | $ (2,732)

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