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Schedule of Carrying Value of Trust Assets and Obligations Under Supplemental Plan (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Investments held in Rabbi Trust	[1]	$ 8,908
Obligations under the supplemental plan		$ 32,508
Predecessor
Defined Benefit Plan Disclosure [Line Items]
Investments held in Rabbi Trust			$ 8,759
Obligations under the supplemental plan			$ 29,108
[1] The company plans to liquidate the rabbi trust (valued at $8.9 million as of December 31, 2017) in advance of paying a lump sum benefit to the former CEO in April 2018 of $9.6 million.

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Defined Benefit Plan Supplemental Plan Obligations

+ References

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- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

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