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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Fair Value Measurement on Company's Assets and Liabilities | The following tables present the Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2017 and 2016:
|  | As of September 30, 2017 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | — |  |  | $ | 98,385 |  |  | $ | — |  |  | $ | 98,385 |
U.S. government treasuries |  |  | 84,363 |  |  |  | — |  |  |  | — |  |  |  | 84,363 |
U.S. agency securities |  |  | — |  |  |  | 60,646 |  |  |  | — |  |  |  | 60,646 |
Money market funds |  |  | 52,504 |  |  |  | — |  |  |  | — |  |  |  | 52,504 |
Asset backed obligations |  |  | — |  |  |  | 47,074 |  |  |  | — |  |  |  | 47,074 |
Commercial paper and certificates of deposit |  |  | — |  |  |  | 33,448 |  |  |  | — |  |  |  | 33,448 |
Supranational and sovereign debt |  |  | — |  |  |  | 8,777 |  |  |  | — |  |  |  | 8,777 |
Total available-for-sale securities |  |  | 136,867 |  |  |  | 248,330 |  |  |  | — |  |  |  | 385,197 |
Derivative financial instruments, net |  |  | — |  |  |  | 27,352 |  |  |  | — |  |  |  | 27,352 |
Other liabilities |  |  | — |  |  |  | — |  |  |  | (21,972 | ) |  |  | (21,972 | )
Total |  | $ | 136,867 |  |  | $ | 275,682 |  |  | $ | (21,972 | ) |  | $ | 390,577 |
|  | As of September 30, 2016 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | — |  |  | $ | 96,154 |  |  | $ | — |  |  | $ | 96,154 |
U.S. government treasuries |  |  | 105,513 |  |  |  | — |  |  |  | — |  |  |  | 105,513 |
U.S. agency securities |  |  | — |  |  |  | 48,393 |  |  |  | — |  |  |  | 48,393 |
Money market funds |  |  | 449,288 |  |  |  | — |  |  |  | — |  |  |  | 449,288 |
Asset backed obligations |  |  | — |  |  |  | 30,194 |  |  |  | — |  |  |  | 30,194 |
Commercial paper and certificates of deposit |  |  | — |  |  |  | 42,498 |  |  |  | — |  |  |  | 42,498 |
Supranational and sovereign debt |  |  | — |  |  |  | 8,342 |  |  |  | — |  |  |  | 8,342 |
Total available-for-sale securities |  |  | 554,801 |  |  |  | 225,581 |  |  |  | — |  |  |  | 780,382 |
Derivative financial instruments, net |  |  | — |  |  |  | 16,067 |  |  |  | — |  |  |  | 16,067 |
Other liabilities |  |  | — |  |  |  | — |  |  |  | (24,597 | ) |  |  | (24,597 | )
Total |  | $ | 554,801 |  |  | $ | 241,648 |  |  | $ | (24,597 | ) |  | $ | 771,852 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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