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Fair Value Measurements - Fair Value Measurement on Company's Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | $ 801,682 | $ 977,639
Derivative financial instruments, net | (13,097) | (1,358)
Other liabilities | (3,266) | (35,944)
Total | 785,319 | 940,337
Level 1 [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 589,753 | 770,460
Total | 589,753 | 770,460
Level 2 [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 211,929 | 207,179
Derivative financial instruments, net | (13,097) | (1,358)
Total | 198,832 | 205,821
Level 3 [Member] |  |
Available-for-sale securities: |  |
Other liabilities | (3,266) | (35,944)
Total | (3,266) | (35,944)
Recurring [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 470,286 | 649,745
Recurring [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 117,452 | 118,708
Recurring [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 101,603 | 102,420
Recurring [Member] | U.S. Agency Securities [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 45,181 | 41,649
Recurring [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 29,215 | 29,095
Recurring [Member] | Commercial Paper and Certificates of Deposit [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 27,502 | 28,509
Recurring [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 10,443 | 5,799
Recurring [Member] | Government-Guaranteed Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 1,187
Recurring [Member] | Mortgages [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 527
Recurring [Member] | Level 1 [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 470,286 | 649,745
Recurring [Member] | Level 1 [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 117,452 | 118,708
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 | 2,007
Recurring [Member] | Level 2 [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 101,603 | 102,420
Recurring [Member] | Level 2 [Member] | U.S. Agency Securities [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 45,181 | 41,649
Recurring [Member] | Level 2 [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 29,215 | 29,095
Recurring [Member] | Level 2 [Member] | Commercial Paper and Certificates of Deposit [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 25,487 | 26,502
Recurring [Member] | Level 2 [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | $ 10,443 | 5,799
Recurring [Member] | Level 2 [Member] | Government-Guaranteed Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | 1,187
Recurring [Member] | Level 2 [Member] | Mortgages [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments |  | $ 527

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