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Fair Value Measurements - Fair Value Measurement on Company's Assets and Liabilities (Detail) - Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | $ 385,197 | $ 780,382
Derivative financial instruments, net | 27,352 | 16,067
Other liabilities | (21,972) | (24,597)
Total | 390,577 | 771,852
Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 98,385 | 96,154
U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 84,363 | 105,513
U.S. Agency Securities [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 60,646 | 48,393
Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 52,504 | 449,288
Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 47,074 | 30,194
Commercial Paper and Certificates of Deposit [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 33,448 | 42,498
Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 8,777 | 8,342
Level 1 [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 136,867 | 554,801
Total | 136,867 | 554,801
Level 1 [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 84,363 | 105,513
Level 1 [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 52,504 | 449,288
Level 2 [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 248,330 | 225,581
Derivative financial instruments, net | 27,352 | 16,067
Total | 275,682 | 241,648
Level 2 [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 98,385 | 96,154
Level 2 [Member] | U.S. Agency Securities [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 60,646 | 48,393
Level 2 [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 47,074 | 30,194
Level 2 [Member] | Commercial Paper and Certificates of Deposit [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 33,448 | 42,498
Level 2 [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 8,777 | 8,342
Level 3 [Member] |  |
Available-for-sale securities: |  |
Other liabilities | (21,972) | (24,597)
Total | $ (21,972) | $ (24,597)

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