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Available-for-Sale Securities - Interest-bearing Investments in Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 779,809 | $ 801,359
Gross Unrealized Gains | 640 | 456
Gross Unrealized Losses | 67 | 133
Fair Value | 780,382 | 801,682
Money Market Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 449,288 | 470,286
Fair Value | 449,288 | 470,286
U.S. Government Treasuries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 105,377 | 117,235
Gross Unrealized Gains | 151 | 217
Gross Unrealized Losses | 15 |
Fair Value | 105,513 | 117,452
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 95,852 | 101,613
Gross Unrealized Gains | 339 | 123
Gross Unrealized Losses | 37 | 133
Fair Value | 96,154 | 101,603
U.S. Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 48,339 | 45,105
Gross Unrealized Gains | 69 | 76
Gross Unrealized Losses | 15 |
Fair Value | 48,393 | 45,181
Asset Backed Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 30,121 | 29,195
Gross Unrealized Gains | 73 | 20
Fair Value | 30,194 | 29,215
Commercial Paper and Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 42,498 | 27,502
Fair Value | 42,498 | 27,502
Supranational and Sovereign Debt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 8,334 | 10,423
Gross Unrealized Gains | 8 | 20
Fair Value | $ 8,342 | $ 10,443

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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