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Employee Benefit Plans - Additional Information (Detail) $ in Millions	Jun. 30, 2017 USD ($)
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution	$ 16.0
OPEB
Defined Benefit Plan Disclosure [Line Items]
Expected contribution	$ 1.1

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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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- Definition

Amount of contributions received and expected to be received by defined benefit plan from 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

+ Details

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- Details

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- Details

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