SHARE-BASED AND OTHER COMPENSATION, Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant (in shares) (up to)	7,400,000
Limit on the number shares that eligible employees may purchase in any calendar year (lesser than) (in shares)	1,000
Limit on the value of shares that eligible employees may purchase in any calendar year	$ 25,000
Purchase price of the stock in relation to the market price (one day prior to the purchase) (in hundredths)	85.00%
Number of shares sold during the period (in shares)	466,000	424,000	336,000
Discount from market value (in hundredths)	15.00%	15.00%	15.00%
Total share-based expense	$ 5,000,000	$ 5,000,000	$ 5,000,000