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Income Taxes (Tables) | 9 Months Ended
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Mar. 31, 2019
Income Tax Disclosure [Abstract] |
Schedule of Details of Income Taxes | The following table provides details of income taxes:
| Three months ended March 31, |  | Nine months ended March 31,
(Dollar amounts in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Income before income taxes | $ | 221,390 |  |  | $ | 365,983 |  |  | $ | 1,064,921 |  |  | $ | 1,049,442 |
Provision for income taxes | $ | 28,745 |  |  | $ | 59,102 |  |  | $ | 107,232 |  |  | $ | 595,944 |
Effective tax rate | 13.0 | % |  | 16.1 | % |  | 10.1 | % |  | 56.8 | %
Summary of Changes to Gross Unrecognized Tax Benefits | The following table summarizes the changes to our gross unrecognized tax benefits for the three months ended March 31, 2019:
(Dollar amounts in thousands) | Unrecognized Tax Benefits
Balance on December 31, 2018 | $ | 69,779 |
Addition related to acquisitions | 61,483 |
Addition for tax positions related to current year | 10,935 |
Addition for tax positions related to prior years | 1,273 |
Reduction for tax positions related to prior years | (10,144 | )
Balance on March 31, 2019 | 133,326 |

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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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