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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2019 | Jun. 30, 2021 | Sep. 30, 2020
Loss Contingencies [Line Items] |  |  |  |
Reserves for environmental liabilities | $ 100.0 |  | $ 100.0 | $ 130.0
Accrued Environmental Loss Contingencies, Current | 50.0 |  | 50.0 | 61.0
Accrued Environmental Loss Contingencies, Noncurrent | 50.0 |  | 50.0 | 69.0
Conditional asset retirement obligations | 29.0 |  | 29.0 | 29.0
Estimated asbestos related net liability on a discounted basis | 78.0 |  | 78.0 | 115.0
Liability for Asbestos and Environmental Claims, Gross | 466.0 |  | 466.0 | 483.0
Restricted Cash and Investments | 388.0 |  | 388.0 | 368.0
Restricted Cash and Cash Equivalents | 7.0 |  | 7.0 | 9.0
Insurance Recoveries |  |  | 61.0 | 68.0
Insurable liabilities | 359.0 |  | 359.0 | 363.0
Insurance Settlements Receivable | 21.0 |  | 21.0 | 21.0
Insurance Settlements Receivable, Current | 5.0 |  | 5.0 | 5.0
Insurance Settlements Receivable, Noncurrent | 16.0 |  | 16.0 | 16.0
Litigation Settlement, Amount Awarded to Other Party | 17.5 |  |  |
Asbestos Issue [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Restricted Cash and Cash Equivalents | 7.0 |  | 7.0 | 9.0
Restricted Investments | 320.0 |  | 320.0 | 291.0
Accrued Compensation and Benefits [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Insurable liabilities | 23.0 |  | 23.0 | 22.0
Other Current Assets |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Restricted Cash and Investments | 19.0 |  | 19.0 | 39.0
Other Noncurrent Assets |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Restricted Cash and Investments | 369.0 |  | 369.0 | 329.0
Other Noncurrent Liabilities [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for Asbestos and Environmental Claims, Gross | 417.0 |  | 417.0 | 434.0
Insurable liabilities | 247.0 |  | 247.0 | 258.0
Other Current Liabilities |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for Asbestos and Environmental Claims, Gross | 49.0 |  | 49.0 | 49.0
Insurable liabilities | $ 89.0 |  | $ 89.0 | $ 83.0
Stanton Street Facility, Marinette, WI [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Environmental Remediation Expense |  | $ 140.0 |  |

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