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Derivative Financial Instruments - Changes in Net Unrealized Gains (Losses) on Cash Flow Hedges (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net unrealized (loss) gain on cash flow hedges, net of tax, beginning of period	$ (26,608)	$ 24,508	$ 12,514
Changes in fair value of cash flow hedges, net of tax	19,228	(31,908)	36,765
Reclassification of loss (gain) into earnings, net of tax	11,325	(19,208)	(24,771)
Net unrealized gain (loss) on cash flow hedges, net of tax, end of period	$ 3,945	$ (26,608)	$ 24,508

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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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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