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Derivative Financial Instruments - Changes in Net Unrealized (Losses) Gains on Cash Flow Hedges (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized gain (loss) on cash flow hedges, net of tax, beginning of period	$ 24,508	$ 12,514
Net unrealized (loss) gain on cash flow hedges, net of tax, end of period	(26,608)	24,508	$ 12,514
Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized gain (loss) on cash flow hedges, net of tax, beginning of period	24,508	12,514	(12,152)
Changes in fair value of cash flow hedges, net of tax	(31,908)	36,765	20,911
Reclassification of (gain) loss into earnings, net of tax	(19,208)	(24,771)	3,755
Net unrealized (loss) gain on cash flow hedges, net of tax, end of period	$ (26,608)	$ 24,508	$ 12,514

X

- Definition

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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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.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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