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STOCK-BASED COMPENSATION - Summary of Compensation Cost for Stock-Based Payment Arrangements (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 8,878 $ 7,926 $ 25,467 $ 23,472
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 719 1,815 3,073 5,887
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 6,771 6,111 19,374 17,585
Performance share units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 1,388 $ 0 $ 3,020 $ 0