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Retirement and Other Benefit Plans - Schedule Of Fair Value Of Financial Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 77,200 | $ 73,300 | $ 65,000
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 2,100 | 2,100 |
Domestic large capitalization |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 8,800 | 8,700 |
Domestic small/mid capitalization |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 2,400 | 2,700 |
International funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 10,600 | 10,800 |
Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 49,700 | 45,600 |
Real estate investment |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3,600 | $ 3,400 |
Investment funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 13,000 |  |
Investment funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 19,300 |  |
Investment funds | Level 0 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 44,900 |  |

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