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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)