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Cash, Cash Equivalents and Investments (Summary Of Cash, Cash Equivalents And Trading And Available-For-Sale Investments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Nov. 30, 2013 | Nov. 30, 2012
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | $ 260,406 | $ 385,640
Realized Losses | (380) |
Unrealized Gains | 164 | 255
Unrealized Losses | (3,989) | (4,357)
Fair Value | 256,201 | 381,538
State And Municipal Bond Obligations [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 30,938 | 50,565
Realized Losses | 0 |
Unrealized Gains | 164 | 255
Unrealized Losses | 0 | (2)
Fair Value | 31,102 | 50,818
Auction Rate Securities - Municipal Bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 27,150 | 27,175
Realized Losses | (380) |
Unrealized Gains | 0 | 0
Unrealized Losses | (3,317) | (3,755)
Fair Value | 23,453 | 23,420
Auction Rate Securities - Student Loans [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 3,500 | 3,500
Realized Losses | 0 |
Unrealized Gains | 0 | 0
Unrealized Losses | (672) | (599)
Fair Value | 2,828 | 2,901
Corporate Bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis |  | 2,608
Unrealized Gains |  | 0
Unrealized Losses |  | (1)
Fair Value |  | 2,607
Cash [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 144,305 | 176,201
Fair Value | 144,305 | 176,201
Money Market Funds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 54,513 | 125,591
Fair Value | $ 54,513 | $ 125,591

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