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Business (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018 | Oct. 01, 2018
Income Taxes [Abstract] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate |  |  | 21.00% |  | 24.53% |
Income Tax Reconciliation Change In Enacted Tax Rate |  |  |  | $ 31,487 |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Minority Interest Ownership Percentage By Parent | 80.00% |  | 80.00% |  |  |
MinorityInterestOwnershipPercentageByNoncontrollingOwners | 20.00% |  | 20.00% |  |  |
Redeemable Noncontrolling Interest, Current Value | $ 1,428 |  | $ 1,428 |  |  |
Minority Interest Change in Redemption Value | $ 0 | $ 44 | $ 0 | $ 44 |  |
New Accounting Pronouncements And Changes In Accounting Principles (Abstract) |  |  |  |  |  |
New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets 1 |  |  |  |  |  | $ 102

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