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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)