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Schedule of Assumptions, Net Benefit Obligation (Detail) | Dec. 31, 2017 | Mar. 31, 2017
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Pension Plans, Defined Benefit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 3.80% |
Rates of annual increase in compensation levels | 3.00% |
Pension Plans, Defined Benefit | Predecessor |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate |  | 4.25%
Rates of annual increase in compensation levels |  | 3.00%
Other Pension Plans, Defined Benefit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 3.80% |
Other Pension Plans, Defined Benefit | Predecessor |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate |  | 4.25%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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