Quarterly report pursuant to Section 13 or 15(d)

Provision for Income Taxes (Detail)

v3.19.1
Provision for Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Income Tax Disclosure [Abstract]          
Blended statutory tax rate, percent         24.50%
Income tax benefit related to tax act     $ 3.5    
Effective tax rate, percent 26.10% 29.80% 25.10% 15.20%