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STOCKHOLDERS' EQUITY - Stock-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
STOCKHOLDERS' EQUITY        
Stock-based compensation expense   $ 29,124 $ 28,072 $ 26,771
Weighted average assumptions used to determine the fair value calculations for stock options issued        
Expected holding period (in years)   4 years 6 months 4 years 6 months 4 years 6 months
Weighted-Average Fair Value        
Granted (in dollars per share)   $ 87.90 $ 90.31 $ 80.40
RSU        
STOCKHOLDERS' EQUITY        
Unrecognized compensation cost   $ 13,900    
Weighted-average period   2 years    
Stock Options        
STOCKHOLDERS' EQUITY        
Unrecognized compensation cost   $ 700    
Weighted-average period   2 years    
OSI Plans        
STOCKHOLDERS' EQUITY        
Shares available for grant   700,000    
Weighted-Average Fair Value        
Additional maximum number of shares of common stock which may be issued 1,650,000      
Increase in maximum number of shares authorized under share based compensation plan 7,100,000      
OSI Plans | RSU        
Shares        
Nonvested at the beginning of the period (in shares)   427,447 435,925 423,590
Granted (in shares)   357,475 334,435 339,311
Vested (in shares)   (313,862) (337,442) (313,892)
Forfeited (in shares)   (15,545) (5,471) (13,084)
Nonvested at the end of the period (in shares)   455,515 427,447 435,925
Weighted-Average Fair Value        
Nonvested at the beginning of the period (in dollars per share)   $ 90.17 $ 84.16 $ 88.68
Granted (in dollars per share)   87.90 90.31 80.40
Vested (in dollars per share)   96.36 82.66 86.12
Forfeited (in dollars per share)   88.42 83.66 85.78
Nonvested at the end of the period (in dollars per share)   $ 85.15 $ 90.17 $ 84.16
OSI Plans | Restricted stock and RSU        
STOCKHOLDERS' EQUITY        
Number of shares available for grant reduced for each award granted   1.87    
Number of shares available for grant increased for each award forfeited and returned   1.87    
Weighted-Average Fair Value        
Total fair value of shares vested   $ 27,900 $ 27,900 $ 27,000
OSI Plans | Restricted stock and RSU | Minimum        
STOCKHOLDERS' EQUITY        
Vesting period   3 years    
OSI Plans | Restricted stock and RSU | Maximum        
STOCKHOLDERS' EQUITY        
Vesting period   4 years    
OSI Plans | Stock Options        
STOCKHOLDERS' EQUITY        
Vesting period   3 years    
Number of Options        
Outstanding at the beginning of the period (in shares)   110,645 255,220 326,304
Granted (in shares)   23,351 22,954 22,171
Exercised (in shares)   (47,354) (166,629) (88,657)
Expired or forfeited (in shares)   (2,965) (900) (4,598)
Outstanding at the end of the period (in shares)   83,677 110,645 255,220
Exercisable at the end of the period (in shares)   38,977    
Weighted average assumptions used to determine the fair value calculations for stock options issued        
Risk-free interest rate (as percent)   3.90% 1.20% 0.40%
Expected volatility (as percent)   31.00% 31.00% 26.00%
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share)   $ 82.43 $ 50.24 $ 44.41
Granted (in dollars per share)   87.90 96.38 82.17
Exercised (in dollars per share)   77.42 35.09 35.19
Expired or forfeited (in dollars per share)   74.06 73.99 80.46
Outstanding at the end of the period (in dollars per share)   87.09 82.43 50.24
Exercisable at the end of the period (in dollars per share)   $ 83.79    
Weighted-Average Remaining Contractual Term        
Outstanding at the end of the period   7 years 1 month 6 days    
Exercisable at the end of the period   5 years 1 month 6 days    
Aggregate Intrinsic Value        
Outstanding at the end of the period   $ 2,572    
Exercisable at the end of the period   $ 1,327    
Stock-based compensation, other disclosures        
Weighted-average grant-date fair value of stock options (in dollars per share)   $ 28.46 $ 26.72 $ 18.37
Total intrinsic value of options exercised   $ 1,500    
OSI Plans | Performance-based restricted stock units        
Shares        
Granted (in shares)   110,811 96,620 136,242
OSI Plans | Performance-based restricted stock units | Minimum        
STOCKHOLDERS' EQUITY        
Payout as a percentage of the original number of shares awarded or units awarded, which are converted into shares of the company's common stock   0.00%    
OSI Plans | Performance-based restricted stock units | Maximum        
STOCKHOLDERS' EQUITY        
Payout as a percentage of the original number of shares awarded or units awarded, which are converted into shares of the company's common stock   376.00%    
OSI Plans | Incentive stock options | Minimum        
STOCKHOLDERS' EQUITY        
Percentage of voting power owned   10.00%    
Purchase price expressed as a percentage of the fair market value of the Company's common stock on the date of grant   110.00%    
OSI Plans | Nonqualified options | Minimum        
STOCKHOLDERS' EQUITY        
Percentage of voting power owned   10.00%    
Purchase price expressed as a percentage of the fair market value of the Company's common stock on the date of grant   110.00%    
Employee Stock Purchase Plan        
STOCKHOLDERS' EQUITY        
Shares available for grant   416,762    
Employee Stock Purchase Plan | Maximum        
STOCKHOLDERS' EQUITY        
Discount rate for eligible employees to purchase common stock (as a percent)   15.00%    
Cost of goods sold        
STOCKHOLDERS' EQUITY        
Stock-based compensation expense   $ 911 $ 812 $ 760
Selling, general and administrative        
STOCKHOLDERS' EQUITY        
Stock-based compensation expense   27,716 26,749 25,457
Research and development        
STOCKHOLDERS' EQUITY        
Stock-based compensation expense   $ 497 $ 511 $ 554