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Fair Value Measurements - Fair Value Measurement on Company's Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | $ 780,382 | $ 801,682
Derivative financial instruments, net | 16,067 | (13,097)
Other liabilities | (24,597) | (3,266)
Total | 771,852 | 785,319
Level 1 [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 554,801 | 589,753
Total | 554,801 | 589,753
Level 2 [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 225,581 | 211,929
Derivative financial instruments, net | 16,067 | (13,097)
Total | 241,648 | 198,832
Level 3 [Member] |  |
Available-for-sale securities: |  |
Other liabilities | (24,597) | (3,266)
Total | (24,597) | (3,266)
Recurring [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 449,288 | 470,286
Recurring [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 105,513 | 117,452
Recurring [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 96,154 | 101,603
Recurring [Member] | U.S. Agency Securities [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 48,393 | 45,181
Recurring [Member] | Commercial Paper and Certificates of Deposit [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 42,498 | 27,502
Recurring [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 30,194 | 29,215
Recurring [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 8,342 | 10,443
Recurring [Member] | Level 1 [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 449,288 | 470,286
Recurring [Member] | Level 1 [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 105,513 | 117,452
Recurring [Member] | Level 1 [Member] | Commercial Paper and Certificates of Deposit [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 2,015
Recurring [Member] | Level 2 [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 96,154 | 101,603
Recurring [Member] | Level 2 [Member] | U.S. Agency Securities [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 48,393 | 45,181
Recurring [Member] | Level 2 [Member] | Commercial Paper and Certificates of Deposit [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 42,498 | 25,487
Recurring [Member] | Level 2 [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 30,194 | 29,215
Recurring [Member] | Level 2 [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | $ 8,342 | $ 10,443

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