Income Taxes (Tables)

6 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of components of income tax expense (benefit)

	Three Months Ended   March 31,						Six Months Ended   March 31,
(dollars in thousands)	2018			2017			2018			2017
Provision for income taxes	$	6,123		$	5,659		$	19,491		$	8,023
Effective tax rate	29.0		%	24.5		%	57.1		%	20.8		%