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Defined Benefit Pension Plan - Fair Value Estimates (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | ---
Defined benefit pension plan |  |  |
Fair values | $ 25,779 | $ 25,132 | $ 26,943
Total |  |  |
Defined benefit pension plan |  |  |
Fair values | 25,779 | 25,132 |
Level 1 |  |  |
Defined benefit pension plan |  |  |
Fair values | 94 | 296 |
Level 2 |  |  |
Defined benefit pension plan |  |  |
Fair values | 25,685 | 24,836 |
Level 3 |  |  |
Defined benefit pension plan |  |  |
Fair values | 0 | 0 |
Equity securities | Total |  |  |
Defined benefit pension plan |  |  |
Fair values | 5,077 | 11,489 |
Equity securities | Level 1 |  |  |
Defined benefit pension plan |  |  |
Fair values | 0 | 0 |
Equity securities | Level 2 |  |  |
Defined benefit pension plan |  |  |
Fair values | 5,077 | 11,489 |
Equity securities | Level 3 |  |  |
Defined benefit pension plan |  |  |
Fair values | 0 | 0 |
Fixed-income securities | Total |  |  |
Defined benefit pension plan |  |  |
Fair values |  | 13,347 |
Fixed-income securities | Level 1 |  |  |
Defined benefit pension plan |  |  |
Fair values |  | 0 |
Fixed-income securities | Level 2 |  |  |
Defined benefit pension plan |  |  |
Fair values |  | 13,347 |
Fixed-income securities | Level 3 |  |  |
Defined benefit pension plan |  |  |
Fair values |  | 0 |
Cash equivalents | Total |  |  |
Defined benefit pension plan |  |  |
Fair values |  | 296 |
Cash equivalents | Level 1 |  |  |
Defined benefit pension plan |  |  |
Fair values |  | 296 |
Cash equivalents | Level 2 |  |  |
Defined benefit pension plan |  |  |
Fair values |  | 0 |
Cash equivalents | Level 3 |  |  |
Defined benefit pension plan |  |  |
Fair values |  | $ 0 |
Corporate bonds | Total |  |  |
Defined benefit pension plan |  |  |
Fair values | 14,546 |  |
Corporate bonds | Level 1 |  |  |
Defined benefit pension plan |  |  |
Fair values | 0 |  |
Corporate bonds | Level 2 |  |  |
Defined benefit pension plan |  |  |
Fair values | 14,546 |  |
Corporate bonds | Level 3 |  |  |
Defined benefit pension plan |  |  |
Fair values | 0 |  |
Diversified fund | Total |  |  |
Defined benefit pension plan |  |  |
Fair values | 6,062 |  |
Diversified fund | Level 1 |  |  |
Defined benefit pension plan |  |  |
Fair values | 0 |  |
Diversified fund | Level 2 |  |  |
Defined benefit pension plan |  |  |
Fair values | 6,062 |  |
Diversified fund | Level 3 |  |  |
Defined benefit pension plan |  |  |
Fair values | 0 |  |
Cash | Total |  |  |
Defined benefit pension plan |  |  |
Fair values | 94 |  |
Cash | Level 1 |  |  |
Defined benefit pension plan |  |  |
Fair values | 94 |  |
Cash | Level 2 |  |  |
Defined benefit pension plan |  |  |
Fair values | 0 |  |
Cash | Level 3 |  |  |
Defined benefit pension plan |  |  |
Fair values | $ 0 |  |

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