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STOCK-BASED COMPENSATION - Exercise prices (Details)
shares in Thousands
12 Months Ended
Sep. 30, 2017
$ / shares
shares
Range of Exercise Prices from $21.065 to $38.015  
Information about outstanding and exercisable stock options  
Exercise price, low end of range (in dollars per share) $ 21.065
Exercise price, high end of range (in dollars per share) $ 38.015
Outstanding Stock Options, Options at the end of the period (in shares) | shares 714
Outstanding Stock Options, Weighted-Average Remaining Life 1 year 3 months 18 days
Outstanding Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 30.63
Exercisable Stock Options, Options at the end of the period (in shares) | shares 714
Exercisable Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 30.63
Range of Exercise Prices from $47.29 to $59.76  
Information about outstanding and exercisable stock options  
Exercise price, low end of range (in dollars per share) 47.29
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 1,618
Outstanding Stock Options, Weighted-Average Remaining Life 6 years 3 months 18 days
Outstanding Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 56.46
Exercisable Stock Options, Options at the end of the period (in shares) | shares 1,048
Exercisable Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 55.80
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 946
Outstanding Stock Options, Weighted-Average Remaining Life 7 years 7 months 6 days
Outstanding Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 75.77
Exercisable Stock Options, Options at the end of the period (in shares) | shares 405
Exercisable Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 73.75
Range of Exercise Prices from $21.065 to $81.31  
Information about outstanding and exercisable stock options  
Exercise price, low end of range (in dollars per share) 21.065
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 3,278
Outstanding Stock Options, Weighted-Average Remaining Life 5 years 7 months 6 days
Outstanding Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 56.41
Exercisable Stock Options, Options at the end of the period (in shares) | shares 2,167
Exercisable Stock Options, Weighted-Average Exercise Price (in dollars per share) $ 50.87