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Schedule of Projected and Accumulated Benefit Obligation (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Schedule Of Defined Benefit Plan Change In Benefit Obligation [Line Items]
Projected benefit obligation	$ 103,443
Accumulated benefit obligation	$ 101,287
Predecessor
Schedule Of Defined Benefit Plan Change In Benefit Obligation [Line Items]
Projected benefit obligation		$ 97,941
Accumulated benefit obligation		$ 94,467

X

- Definition

Schedule Of Defined Benefit Plan Change In Benefit Obligation [Line Items]

+ References

No definition available.

+ Details

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X

- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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X

- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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