Postretirement Benefits - Asset Allocation of Plan Assets of Non-U.S. Plans (Detail) - Non-U.S. Plans	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	7.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	3.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	72.00%
Other Investments
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	18.00%

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant