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STOCK PROGRAMS - Summary of Status of Share Units (Details) - Share Units - Non-employee
 12 Months Ended
Jun. 30, 2021
$ / shares
shares
Shares  
Outstanding at the beginning of the period (in shares) | shares 136,800
Granted (in shares) | shares 3,600
Dividend equivalents (in shares) | shares 1,200
Outstanding at the end of the period (in shares) | shares 141,600
Weighted-Average Grant Date Fair Value Per Share  
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 62.46
Weighted-average grant date fair value (in dollars per share) | $ / shares 246.82
Dividend equivalents (in dollars per share) | $ / shares 262.37
Outstanding at the end of the period (in dollars per share) | $ / shares $ 68.73