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Derivative Financial Instruments - Fair Value of Outstanding Derivative Contracts in Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Jun. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2014
--- | --- | --- | ---
Derivatives designated as hedging instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total asset derivatives | $ 2.6 | $ 8.5 |
Total liability derivatives | 9.8 | 3.0 |
Derivatives designated as hedging instruments [Member] | Interest Rate Contract [Member] | Receivables, net [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total asset derivatives |  |  | $ 0.0
Derivatives designated as hedging instruments [Member] | Interest Rate Contract [Member] | Accounts payable and other current liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total liability derivatives | 0.0 | 0.7 |
Derivatives designated as hedging instruments [Member] | Interest Rate Contract [Member] | Other liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total liability derivatives | 1.0 | 0.4 |
Derivatives designated as hedging instruments [Member] | Commodity Swap And Option Agreements [Member] | Receivables, net [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total asset derivatives | 2.1 | 2.9 |
Derivatives designated as hedging instruments [Member] | Commodity Swap And Option Agreements [Member] | Other assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total asset derivatives | 0.2 | 0.0 |
Derivatives designated as hedging instruments [Member] | Foreign Exchange Forward [Member] | Other assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total asset derivatives | 0.0 | 0.1 |
Derivatives designated as hedging instruments [Member] | Foreign Exchange Contract [Member] | Receivables, net [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total asset derivatives | 0.1 | 5.5 |
Derivatives designated as hedging instruments [Member] | Foreign Exchange Contract [Member] | Accounts payable and other current liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total liability derivatives | 7.6 | 1.7 |
Derivatives designated as hedging instruments [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total liability derivatives | 1.1 | 0.1 |
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Accounts payable and other current liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total liability derivatives | 0.1 | 0.1 |
Derivatives designated as hedging instruments [Member] | Interest Rate Swap [Member] | Other assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total asset derivatives |  | 0.2 |
Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total asset derivatives | 2.9 | 8.7 |
Total liability derivatives | 10.8 | 3.2 |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Accounts payable and other current liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total liability derivatives | 1.0 | 0.2 |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Receivables, net [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total asset derivatives | 0.3 | 0.2 |
Fair Value, Measurements, Recurring [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets, Fair Value Disclosure, Recurring | 2.9 | 8.7 |
Liabilities, Fair Value Disclosure, Recurring | 10.8 | 3.2 |
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets, Fair Value Disclosure, Recurring | 0.0 | 0.0 |
Liabilities, Fair Value Disclosure, Recurring | 0.0 | 0.0 |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets, Fair Value Disclosure, Recurring | 2.9 | 8.7 |
Liabilities, Fair Value Disclosure, Recurring | 10.8 | 3.2 |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets, Fair Value Disclosure, Recurring | 0.0 | 0.0 |
Liabilities, Fair Value Disclosure, Recurring | $ 0.0 | $ 0.0 |

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