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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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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