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Pension and Other Post-Retirement Benefits - Additional Information (Detail)	Mar. 31, 2018 USD ($)
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to defined benefit plan for the fiscal year	$ 1,300,000
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to defined benefit plan for the fiscal year	$ 0

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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.

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- Definition

Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920

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