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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Maturities | The carrying value and estimated fair value of the Company’s long-term debt, including current maturities, were as follows (in millions):
| September 30, 2018 |  |  | September 30, 2017 |
| Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
| Value |  |  | Value |  |  | Value |  |  | Value |
Long-term debt, including current maturities(1) | $ | 930.2 |  |  | $ | 926.2 |  |  | $ | 956.9 |  |  | $ | 975.0 |
(1) | Current and prior period long-term debts’ carrying and fair values exclude net debt issuance costs.

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