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Fair Value Measurements - Fair Value Measurement on Company's Assets and Liabilities (Detail) - Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | $ 131,316 | $ 385,197
Derivative financial instruments, net | (27,842) | 27,352
Other liabilities | (37,954) | (21,972)
Total | 65,520 | 390,577
Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 47,531 | 98,385
U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 23,258 | 84,363
U.S. Agency Securities [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 16,033 | 60,646
Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 30,883 | 52,504
Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 9,177 | 47,074
Commercial Paper and Certificates of Deposit [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 33,448
Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 4,434 | 8,777
Level 1 [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 54,141 | 136,867
Total | 54,141 | 136,867
Level 1 [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 23,258 | 84,363
Level 1 [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 30,883 | 52,504
Level 2 [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 77,175 | 248,330
Derivative financial instruments, net | (27,842) | 27,352
Total | 49,333 | 275,682
Level 2 [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 47,531 | 98,385
Level 2 [Member] | U.S. Agency Securities [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 16,033 | 60,646
Level 2 [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 9,177 | 47,074
Level 2 [Member] | Commercial Paper and Certificates of Deposit [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 33,448
Level 2 [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 4,434 | 8,777
Level 3 [Member] |  |
Available-for-sale securities: |  |
Other liabilities | (37,954) | (21,972)
Total | $ (37,954) | $ (21,972)

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