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Cash, Cash Equivalents and Investments - Effective Maturity Dates 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] |
1 Year | $ 101,870
1-2 Years | 98,375
2-3 Years | 111,649
3-4 Years | 29,852
4-5 Years | 7,743
5-7 Years | 6,729
Fair value | 356,218
Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
1 Year | 45,025
1-2 Years | 19,494
2-3 Years | 61,676
3-4 Years | 8,456
4-5 Years | 2,213
Fair value | 136,864
Municipal Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
1 Year | 25,257
1-2 Years | 31,111
2-3 Years | 10,209
3-4 Years | 7,530
4-5 Years | 4,519
5-7 Years | 5,217
Fair value | 83,843
Asset-Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
1 Year | 12,184
1-2 Years | 17,388
2-3 Years | 12,595
3-4 Years | 4,530
5-7 Years | 505
Fair value | 47,202
Treasury Bills [Member] |
Schedule of Available-for-sale Securities [Line Items] |
1 Year | 10,043
1-2 Years | 20,009
2-3 Years | 15,980
Fair value | 46,032
Covered Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
1 Year | 4,664
1-2 Years | 961
3-4 Years | 1,796
Fair value | 7,421
Agency Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
1 Year | 2,998
1-2 Years | 8,647
2-3 Years | 7,935
3-4 Years | 5,425
4-5 Years | 1,011
5-7 Years | 1,007
Fair value | 27,023
Sovereign Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
1 Year | 1,699
1-2 Years | 765
2-3 Years | 3,254
3-4 Years | 2,115
Fair value | $ 7,833

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- Definition Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. + 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 (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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