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Fair Value Measurements - Fair Value Measurement on Company's Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | $ 69,370 | $ 131,316
Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 47,531
Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 69,370 | 30,883
U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 23,258
U.S. Agency Securities [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 16,033
Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 9,177
Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 4,434
Recurring [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 69,370 | 131,316
Equity Investment | 18,008 |
Derivative financial instruments, net | 7,890 | (27,842)
Other liabilities | (29,805) | (37,954)
Total | 65,463 | 65,520
Recurring [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 47,531
Recurring [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 69,370 | 30,883
Recurring [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 23,258
Recurring [Member] | U.S. Agency Securities [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 16,033
Recurring [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 9,177
Recurring [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 4,434
Level 1 [Member] | Recurring [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 69,370 | 54,141
Total | 69,370 | 54,141
Level 1 [Member] | Recurring [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 69,370 | 30,883
Level 1 [Member] | Recurring [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 23,258
Level 2 [Member] | Recurring [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 77,175
Derivative financial instruments, net | 7,890 | (27,842)
Total | 7,890 | 49,333
Level 2 [Member] | Recurring [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 47,531
Level 2 [Member] | Recurring [Member] | U.S. Agency Securities [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 16,033
Level 2 [Member] | Recurring [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 9,177
Level 2 [Member] | Recurring [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 4,434
Level 3 [Member] | Recurring [Member] |  |
Available-for-sale securities: |  |
Equity Investment | 18,008 |
Other liabilities | (29,805) | (37,954)
Total | $ (11,797) | $ (37,954)

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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 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: 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=82897076&loc=d3e27161-111563 + Details
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