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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 | Aug. 31, 2016 | Nov. 30, 2015
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Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | $ 232,638 | $ 241,276
Unrealized Gains | 50 | 30
Unrealized Losses | (4) | (27)
Fair Value | 232,684 | 241,279
State and municipal bond obligations [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 34,489 | 20,387
Unrealized Gains | 43 | 30
Unrealized Losses |  | 0
Fair Value | 34,532 | 20,417
U.S. treasury bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 6,534 | 3,109
Unrealized Gains | 0 | 0
Unrealized Losses |  | (15)
Fair Value | 6,534 | 3,094
U.S. government agency bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 525 | 1,645
Unrealized Gains | 1 | 0
Unrealized Losses | (4) | (4)
Fair Value | 522 | 1,641
Corporate bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 3,006 | 3,756
Unrealized Gains | 6 | 0
Unrealized Losses |  | (8)
Fair Value | 3,012 | 3,748
Cash [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 179,548 | 186,241
Unrealized Gains | 0 | 0
Unrealized Losses |  | 0
Fair Value | 179,548 | 186,241
Money market funds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 8,536 | 26,138
Unrealized Gains | 0 | 0
Unrealized Losses |  | 0
Fair Value | $ 8,536 | $ 26,138

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