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STOCK-BASED COMPENSATION - Exercise prices (Details)
shares in Thousands
12 Months Ended
Sep. 30, 2018
$ / shares
shares
Information about outstanding and exercisable stock options  
Outstanding Stock Options, Options at the end of the period (in shares) | shares 3,499
Exercisable Stock Options, Options at the end of the period (in shares) | shares 2,193
Range of Exercise Prices from $0.00 to $21.07  
Information about outstanding and exercisable stock options  
Exercise price, low end of range (in dollars per share) $ 0.000
Exercise price, high end of range (in dollars per share) $ 21.070
Outstanding Stock Options, Options at the end of the period (in shares) | shares 180
Outstanding Stock Options, Weighted-Average Remaining Life 2 months 12 days
Outstanding Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 21.07
Exercisable Stock Options, Options at the end of the period (in shares) | shares 180
Exercisable Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 21.07
Range of Exercise Prices from $21.07 to $59.76  
Information about outstanding and exercisable stock options  
Exercise price, low end of range (in dollars per share) 21.07
Exercise price, high end of range (in dollars per share) $ 59.76
Outstanding Stock Options, Options at the end of the period (in shares) | shares 2,417
Outstanding Stock Options, Weighted-Average Remaining Life 5 years 10 months 24 days
Outstanding Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 55.16
Exercisable Stock Options, Options at the end of the period (in shares) | shares 1,418
Exercisable Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 53.03
Range of Exercise Prices from $59.76 to $68.83  
Information about outstanding and exercisable stock options  
Exercise price, low end of range (in dollars per share) 59.76
Exercise price, high end of range (in dollars per share) $ 68.83
Outstanding Stock Options, Options at the end of the period (in shares) | shares 358
Outstanding Stock Options, Weighted-Average Remaining Life 6 years 3 months 18 days
Outstanding Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 68.66
Exercisable Stock Options, Options at the end of the period (in shares) | shares 275
Exercisable Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 68.83
Range of Exercise Prices from $68.83 to $81.31  
Information about outstanding and exercisable stock options  
Exercise price, low end of range (in dollars per share) 68.83
Exercise price, high end of range (in dollars per share) $ 81.31
Outstanding Stock Options, Options at the end of the period (in shares) | shares 544
Outstanding Stock Options, Weighted-Average Remaining Life 7 years 1 month 6 days
Outstanding Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 79.79
Exercisable Stock Options, Options at the end of the period (in shares) | shares 320
Exercisable Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 79.86