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Income Taxes (Tables) | 3 Months Ended
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Sep. 30, 2017
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) | 2017 |  | 2016
Income before income taxes | $ | 336,152 |  |  | $ | 222,220 |
Provision for income taxes | $ | 55,216 |  |  | $ | 44,119 |
Effective tax rate | 16.4 | % |  | 19.9 | %

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