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INCOME TAXES - Unrecognized tax benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Activity of unrecognized tax benefits |  |
Balance at the beginning of the year | $ 19,677 | $ 13,310
Additions on tax positions for the current year | 3,084 | 5,937
Additions on tax positions from prior years | 1,479 | 678
Reduction in tax positions from prior year | (10,663) | (248)
Balance at the end of the year | 13,577 | 19,677
Deferred income tax assets: |  |
Tax credit carryforwards | 13,130 | 16,767
Net operating loss carryforwards | 6,494 | 3,745
Customer advances | 2,848 | 2,819
Allowance for doubtful accounts | 4,471 | 5,266
Inventory reserve | 11,636 | 10,391
Inventory capitalization | 406 | 489
Accrued liabilities | 3,241 | 4,466
Operating lease liabilities | 8,714 | 10,522
Stock and deferred compensation | 10,601 | 12,323
Other assets | 1,446 | 2,685
Total deferred income tax assets | 62,987 | 69,473
Valuation allowance | (12,301) | (16,177)
Net deferred income tax assets | 50,686 | 53,296
Deferred income tax liabilities: |  |
Depreciation | (7,604) | (2,137)
Amortization of intangible assets | (31,518) | (31,779)
Withholding tax on unrepatriated foreign earnings | (6,851) | (6,851)
Operating lease ROU assets | (8,480) | (10,355)
State transition tax | (1,754) | (1,754)
Convertible debt |  | (2,384)
Other liabilities | (1,750) | (1,036)
Total deferred income tax liabilities | (57,957) | (56,296)
Net deferred income tax liability | $ (7,271) | $ (3,000)

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