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Retirement Benefit Plans - Fair Values of Defined Benefit Plan Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | ---
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | $ 21,344 | $ 20,896 | $ 22,110
Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 19,159 | 18,851 |
Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 2,185 | 2,045 | $ 2,102
Large value |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 492 | 487 |
Large value | Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Large value | Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 492 | 487 |
Large value | Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Large blend |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 9,593 | 9,268 |
Large blend | Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Large blend | Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 9,593 | 9,268 |
Large blend | Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Large growth |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 503 | 515 |
Large growth | Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Large growth | Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 503 | 515 |
Large growth | Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Mid blend |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 57 | 109 |
Mid blend | Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Mid blend | Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 57 | 109 |
Mid blend | Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Small blend |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 56 | 102 |
Small blend | Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Small blend | Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 56 | 102 |
Small blend | Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Foreign large blend |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 1,565 | 1,559 |
Foreign large blend | Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Foreign large blend | Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 1,565 | 1,559 |
Foreign large blend | Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Diversified emerging markets |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 18 | 35 |
Diversified emerging markets | Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Diversified emerging markets | Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 18 | 35 |
Diversified emerging markets | Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Inflation protected bond |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 537 | 489 |
Inflation protected bond | Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Inflation protected bond | Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 537 | 489 |
Inflation protected bond | Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Intermediate term bond |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 7,747 | 7,538 |
Intermediate term bond | Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Intermediate term bond | Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 5,562 | 5,493 |
Intermediate term bond | Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 2,185 | 2,045 |
High inflation bond |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 360 | 340 |
High inflation bond | Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
High inflation bond | Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 360 | 340 |
High inflation bond | Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Emerging markets bonds |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 66 | 56 |
Emerging markets bonds | Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Emerging markets bonds | Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 66 | 56 |
Emerging markets bonds | Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Short-term bonds |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 350 | 398 |
Short-term bonds | Level 1 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 0 | 0 |
Short-term bonds | Level 2 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | 350 | 398 |
Short-term bonds | Level 3 |  |  |
Amounts recognized in the consolidated balance sheets are: |  |  |
Asset Amount | $ 0 | $ 0 |

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