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Fair Value Measurements - Fair Value Measurement on Company's Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	$ 559,385	$ 69,370
Money Market Funds [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	558,633	69,370
Corporate Bonds [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	752
Recurring [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	559,385	69,370
Equity Investments	24,211	18,008
Derivative financial instruments, net	20,636	7,890
Other liabilities	(19,641)	(29,805)
Total	584,591	65,463
Recurring [Member] | Money Market Funds [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	558,633	69,370
Recurring [Member] | Corporate Bonds [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	752
Level 1 [Member] | Recurring [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	558,633	69,370
Total	558,633	69,370
Level 1 [Member] | Recurring [Member] | Money Market Funds [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	558,633	69,370
Level 2 [Member] | Recurring [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	752
Derivative financial instruments, net	20,636	7,890
Total	21,388	7,890
Level 2 [Member] | Recurring [Member] | Corporate Bonds [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	752
Level 3 [Member] | Recurring [Member]
Available-for-sale securities:
Equity Investments	24,211	18,008
Other liabilities	(19,641)	(29,805)
Total	$ 4,570	$ (11,797)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
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Fair value of the entity's equity.

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-Topic 820
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-Section 50
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Fair value portion of other liabilities.

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