XML 62 R51.htm IDEA: XBRL DOCUMENT v3.8.0.1
Current and Deferred Income Tax (Benefit) and Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Deferred Income Tax Assets And Liabilities        
Income before income taxes $ 82,783 $ 66,996 $ 111,453 $ 98,134
Current tax (benefit) expense (1,989) 24,112 (761) 33,034
Deferred tax expense 29,778 3,180 38,490 7,121
Deferred tax expense (benefit) - impact of tax reform 216   (11,236)  
Total deferred tax expense 29,994 3,180 27,254 7,121
Total tax expense $ 28,005 $ 27,292 $ 26,493 $ 40,155