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Schedule of Carrying Value of Trust Assets, Including Unrealized Gains or Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Investments held in Rabbi Trust at fair value	$ 8,908
Obligations under the supplemental plan	$ 32,508
Predecessor
Defined Benefit Plan Disclosure [Line Items]
Investments held in Rabbi Trust at fair value		$ 8,759
Obligations under the supplemental plan		$ 29,108

X

- Definition

Defined Benefit Plan Supplemental Plan Obligations

+ References

No definition available.

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

+ Details

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X

- 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.

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