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Income Taxes (Tables)
 3 Months Ended
Sep. 30, 2019
Income Tax Disclosure [Abstract]  
Schedule of Details of Income Taxes
The following table provides details of income taxes:

Three Months Ended
September 30,
(Dollar amounts in thousands)
2019
 
2018
Income before income taxes
$
371,516

 
$
427,568

Provision for income taxes
$
25,120

 
$
31,624

Effective tax rate
6.8
%
 
7.4
%