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Cash, Cash Equivalents and Investments - Summary of Available-For-Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012
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Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | $ 355,029
Gross Unrealized Gains | 1,295
Gross Unrealized Losses | (106)
Fair value | 356,218
Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair value | 136,864
Corporate Bonds [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 44,935
Gross Unrealized Gains | 94
Gross Unrealized Losses | (4)
Fair value | 45,025
Corporate Bonds [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 91,131
Gross Unrealized Gains | 723
Gross Unrealized Losses | (15)
Fair value | 91,839
Municipal Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair value | 83,843
Municipal Bonds [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 25,241
Gross Unrealized Gains | 17
Gross Unrealized Losses | (1)
Fair value | 25,257
Municipal Bonds [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 58,246
Gross Unrealized Gains | 341
Gross Unrealized Losses | (1)
Fair value | 58,586
Asset-Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair value | 47,202
Asset-Backed Securities [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 12,192
Gross Unrealized Gains | 5
Gross Unrealized Losses | (13)
Fair value | 12,184
Asset-Backed Securities [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 34,998
Gross Unrealized Gains | 48
Gross Unrealized Losses | (28)
Fair value | 35,018
Treasury Bills [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 10,044
Gross Unrealized Losses | (1)
Fair value | 10,043
Treasury Bills [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 35,993
Gross Unrealized Gains | 2
Gross Unrealized Losses | (6)
Fair value | 35,989
Covered Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair value | 7,421
Covered Bonds [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 4,679
Gross Unrealized Losses | (15)
Fair value | 4,664
Covered Bonds [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 2,753
Gross Unrealized Gains | 4
Fair value | 2,757
Agency Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair value | 27,023
Agency Bonds [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 2,999
Gross Unrealized Losses | (1)
Fair value | 2,998
Agency Bonds [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 24,001
Gross Unrealized Gains | 43
Gross Unrealized Losses | (19)
Fair value | 24,025
Sovereign Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair value | 7,833
Sovereign Bonds [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 1,699
Fair value | 1,699
Sovereign Bonds [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 6,118
Gross Unrealized Gains | 18
Gross Unrealized Losses | (2)
Fair value | $ 6,134

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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 No definition available. + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6872113&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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