XML 105 R84.htm IDEA: XBRL DOCUMENT v3.10.0.1
STOCK-BASED COMPENSATION - STOCK-BASED COMPENSATION EXPENSE (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense included in operation and maintenance expense $ 12,845 $ 5,807 $ 7,234
Income tax benefit [1] (3,734) (2,372) (2,955)
Total, net of tax 9,111 3,435 4,279
Tax benefit of delivered shares from stock based compensation 2,950 1,285 1,755
Performance share awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense included in operation and maintenance expense 3,526 2,614 3,188
Restricted and non-restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense included in operation and maintenance expense 2,191 1,732 2,161
Deferred retention stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense included in operation and maintenance expense $ 7,128 $ 1,461 $ 1,885
[1] Excludes additional tax benefit related to delivered shares of $3 million, $1.3 million and $1.8 million as of September 30, 2018, 2017 and 2016, respectively.