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Basis of Presentation and Significant Accounting Policies (Narratives) (Details) (USD $) Share data in Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2014 | Aug. 31, 2013 | Aug. 31, 2014 | Aug. 31, 2013 | Nov. 30, 2013 | Jan. 29, 2013 Convertible Notes Payable [Member] Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member]
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 1.375%
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 5.2 | 5.2 | 5.2 | 5.2 |  |
Cash equivalents | $ 196,200,000 |  | $ 196,200,000 |  | $ 436,200,000 |
Restricted cash | 32,456,000 |  | 32,456,000 |  | 41,906,000 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | $ 28,400,000 | $ 27,300,000 | $ 65,500,000 | $ 11,800,000 |  |

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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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