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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 01, 2019 | Mar. 31, 2020 | Jun. 30, 2019 | Sep. 30, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
ROU assets |  | $ 126,277 |  |
Lease liabilities |  | $ 130,046 |  |
Cumulative effect of change in accounting standards |  |  |  | $ (188,799)
Estimated discount rate |  |  | 3.50% |
ASU 2016-02 [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
ROU assets | $ 77,600 |  |  |
Lease liabilities | 81,300 |  |  |
Derecognized deferred rent | 3,700 |  |  |
Cumulative effect of change in accounting standards | 77,600 |  |  |
Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Deferred revenue recognized over a period of |  | 1 year |  |
Additional ROU assets and lease liabilities due to guidance | 60,000 |  |  |
Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Deferred revenue recognized over a period of |  | 5 years |  |
Additional ROU assets and lease liabilities due to guidance | $ 70,000 |  |  |

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