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Commitments and Contingencies - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |
Estimated asbestos related net liability on a discounted basis | $ 181,000,000 | $ 174,000,000 | $ 181,000,000
Reserves for environmental liabilities | 51,000,000 | 47,000,000 | 51,000,000
Conditional asset retirement obligations | 61,000,000 | 65,000,000 | 61,000,000
Accrued Environmental Loss Contingencies, Current |  | 12,000,000 |
Accrued Environmental Loss Contingencies, Noncurrent |  | 35,000,000 |
Liability for Asbestos and Environmental Claims, Gross | 573,000,000 | 555,000,000 | 573,000,000
Restricted Cash and Investments | 392,000,000 | 381,000,000 | 392,000,000
Restricted Cash and Cash Equivalents | 31,000,000 | 21,000,000 | 31,000,000
Insurance Recoveries |  | 95,000,000 | 101,000,000
Insurable liabilities | 445,000,000 | 439,000,000 | 445,000,000
Insurance Settlements Receivable, Current | 31,000,000 | 6,000,000 | 31,000,000
Insurance Settlements Receivable | 46,000,000 | 21,000,000 | 46,000,000
Insurance Settlements Receivable, Noncurrent | 15,000,000 | $ 15,000,000 | 15,000,000
Arbitration award to plaintiff | $ 50,000,000 |  |
Accrued interest while arbitration award remains outstanding | 9.56% |  |
Class actions lawsuits against the Company |  | 15 |
Other possible individual product liability claims |  | 540 |
Asbestos Issue [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Restricted Cash and Cash Equivalents | $ 22,000,000 | $ 12,000,000 | 22,000,000
Restricted Investments | 269,000,000 | 274,000,000 | 269,000,000
Selling, General And Administrative |  |  |
Loss Contingencies [Line Items] |  |  |
Arbitration award to plaintiff | 50,000,000 |  |
Accrued Compensation and Benefits [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Insurable liabilities | 22,000,000 | 22,000,000 | 22,000,000
Other Current Assets |  |  |
Loss Contingencies [Line Items] |  |  |
Restricted Cash and Investments | 53,000,000 | 57,000,000 | 53,000,000
Other Noncurrent Assets |  |  |
Loss Contingencies [Line Items] |  |  |
Restricted Cash and Investments | 339,000,000 | 324,000,000 | 339,000,000
Other Noncurrent Liabilities [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for Asbestos and Environmental Claims, Gross | 525,000,000 | 501,000,000 | 525,000,000
Insurable liabilities | 301,000,000 | 336,000,000 | 301,000,000
Other Current Liabilities |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for Asbestos and Environmental Claims, Gross | 48,000,000 | 54,000,000 | 48,000,000
Insurable liabilities | $ 122,000,000 | $ 81,000,000 | $ 122,000,000
PENNSYLVANIA |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Number of Plaintiffs |  | 2 |
NEW YORK |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Number of Plaintiffs |  | 32 |
COLORADO |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Number of Plaintiffs |  | 90 |

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