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Available-for-Sale Securities - Interest-bearing Investments in Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 801,359 | $ 977,669
Gross Unrealized Gains | 456 | 242
Gross Unrealized Losses | 133 | 272
Fair Value | 801,682 | 977,639
Money Market Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 470,286 | 649,745
Fair Value | 470,286 | 649,745
U.S. Government Treasuries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 117,235 | 118,652
Gross Unrealized Gains | 217 | 88
Gross Unrealized Losses |  | 32
Fair Value | 117,452 | 118,708
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 101,613 | 102,387
Gross Unrealized Gains | 123 | 152
Gross Unrealized Losses | 133 | 119
Fair Value | 101,603 | 102,420
U.S. Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 45,105 | 41,658
Gross Unrealized Gains | 76 |
Gross Unrealized Losses |  | 9
Fair Value | 45,181 | 41,649
Asset Backed Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 29,195 | 29,160
Gross Unrealized Gains | 20 |
Gross Unrealized Losses |  | 65
Fair Value | 29,215 | 29,095
Commercial Paper and Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 27,502 | 28,509
Fair Value | 27,502 | 28,509
Supranational and Sovereign Debt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 10,423 | 5,804
Gross Unrealized Gains | 20 |
Gross Unrealized Losses |  | 5
Fair Value | $ 10,443 | 5,799
Government-Guaranteed Debt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 1,185
Gross Unrealized Gains |  | 2
Fair Value |  | 1,187
Mortgages [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 569
Gross Unrealized Losses |  | 42
Fair Value |  | $ 527

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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=27724398&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=27724398&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=27724398&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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