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STOCK-BASED COMPENSATION - OSI Plans (Details) - USD ($)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Weighted-Average Fair Value      
Granted (in dollars per share)   $ 74.09 $ 64.55
Employee Stock Purchase Plan      
Stock-based Compensation      
Shares purchased 70,857 80,115 71,314
Shares available for grant 670,833    
Employee Stock Purchase Plan | Maximum      
Stock-based Compensation      
Discount rate for eligible employees to purchase common stock (as a percent) 15.00%    
2006 Plan      
Stock-based Compensation      
Number of awards issued (in shares) 0    
Shares      
Granted (in shares) 0    
OSI Plans | Stock options      
Stock-based Compensation      
Vesting period 3 years    
Weighted average assumptions used to determine the fair value calculations for stock options issued      
Risk-free interest rate (as percent) 2.60% 1.90% 1.70%
Expected volatility (as percent) 28.00% 29.00% 33.00%
Expected holding period (in years) 4 years 6 months 4 years 6 months 4 years 6 months
Number of Options      
Outstanding at the beginning of the period (in shares) 677,525 780,671 934,112
Granted (in shares) 19,259 25,379 19,176
Exercised (in shares) (169,799) (121,651) (168,564)
Expired or forfeited (in shares) (11,101) (6,874) (4,053)
Outstanding at the end of the period (in shares) 515,884 677,525 780,671
Exercisable at the end of the period (in shares) 479,547    
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 32.80 $ 30.00 $ 28.67
Granted (in dollars per share) 73.37 85.83 73.42
Exercised (in dollars per share) 32.11 23.53 26.68
Expired or forfeited (in dollars per share) 70.50 73.77 68.28
Outstanding at the end of the period (in dollars per share) 33.74 32.80 30.00
Exercisable at the end of the period (in dollars per share) $ 30.36    
Weighted-Average Remaining Contractual Term      
Outstanding at the end of the period 2 years 2 months 12 days    
Exercisable at the end of the period 1 year 8 months 12 days    
Aggregate Intrinsic Value      
Outstanding at the end of the period $ 40,700,000    
Exercisable at the end of the period $ 39,454,000    
Stock-based compensation, other disclosures      
Weighted-average grant-date fair value of stock options (in dollars per share) $ 20.45 $ 23.64 $ 22.19
Total intrinsic value of options exercised   $ 9,169,000  
OSI Plans | Nonqualified options | Minimum | Any person who owned more than 10% of the voting power of all classes of stock      
Stock-based Compensation      
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 | Incentive stock options | Minimum | Any person who owned more than 10% of the voting power of all classes of stock      
Stock-based Compensation      
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 | Restricted stock and RSU      
Shares      
Nonvested at the beginning of the period (in shares) 526,377 611,687 530,498
Granted (in shares) 375,580 351,034 379,888
Vested (in shares) (364,410) (413,639) (299,277)
Net replacement RSUs (in Shares)     20,953
Forfeited (in shares) (16,407) (22,705) (20,375)
Nonvested at the end of the period (in shares) 521,140 526,377 611,687
Weighted-Average Fair Value      
Nonvested at the beginning of the period (in dollars per share) $ 71.56 $ 65.85 $ 67.94
Granted (in dollars per share) 74.40 74.09 64.55
Vested (in dollars per share) 70.92 65.33 67.87
Net replacement RSUs ( in dollar per share)     67.76
Forfeited (in dollars per share) 74.13 70.32 68.34
Nonvested at the end of the period (in dollars per share) $ 73.97 $ 71.56 $ 65.85
Total fair value of shares vested $ 25,800,000 $ 27,000,000 $ 23,200,000
OSI Plans | Restricted stock and RSU | Minimum      
Stock-based Compensation      
Vesting period 3 years    
OSI Plans | Restricted stock and RSU | Maximum      
Stock-based Compensation      
Vesting period 4 years    
OSI Plans | Performance-based restricted stock units      
Shares      
Granted (in shares) 97,514 117,346 156,836
OSI Plans | Performance-based restricted stock units | Minimum      
Weighted-Average Fair Value      
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      
Weighted-Average Fair Value      
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 280.00%    
2012 Plan      
Stock-based Compensation      
Shares available for grant 1,600,000    
2012 Plan | Restricted stock and RSU      
Weighted-Average Fair Value      
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