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Hedging Transactions and Derivative Financial Instruments (Additional Information) (Details) $ in Millions | Sep. 30, 2018 Contract | Sep. 30, 2017 USD ($) | Feb. 17, 2017 USD ($)
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Bank Term Loan |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Number of derivative contracts related to minimizing risk associated with potential rise in copper prices (contract) | Contract | 23,000 |  |
Third Amended Credit Agreement | Revolving Credit Facility |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Maximum borrowing capacity |  |  | $ 450.0
Interest rate swap | Third Amended Credit Agreement | Revolving Credit Facility |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Hedged balance on debt instrument |  | $ 75.0 |

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