Schedule of Components of Accumulated Other Comprehensive Gain (Loss) (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Unrealized gain (loss) on derivative contracts	$ (5,242)	$ (4,547)
Tax effect	1,558	1,077
Unrealized gain (loss) on derivative contracts, Total	(3,684)	(3,470)
Pension and post-retirement obligations	(112,750)	(116,346)
Tax effect	38,552	39,804
Pension and post-retirement obligations, Total	(74,198)	(76,542)
Foreign currency translation adjustment	(305,683)	(268,845)
Accumulated other comprehensive gain (loss)	$ (383,565)	$ (348,857)

Accumulated other comprehensive income loss cumulative changes in net gain loss from cash flow hedge effect before tax.

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Accumulated other comprehensive income loss cumulative changes in net gain loss from cash flow hedges effect tax.

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- Definition

Accumulated other comprehensive income loss defined benefit pension and other postretirement plans tax effect.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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