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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 | May 31, 2018 | Nov. 30, 2017
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Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | $ 144,482 | $ 183,902
Unrealized Gains | 0 | 0
Unrealized Losses | (282) | (293)
Fair Value | 144,200 | 183,609
State and municipal bond obligations |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 32,323 | 40,458
Unrealized Gains | 0 | 0
Unrealized Losses | (184) | (231)
Fair value of financial assets | 32,139 |
Fair Value |  | 40,227
U.S. treasury bonds |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 6,704 | 3,517
Unrealized Gains | 0 | 0
Unrealized Losses | (28) | (26)
Fair value of financial assets | 6,676 |
Fair Value |  | 3,491
Corporate bonds |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 8,334 | 6,463
Unrealized Gains | 0 | 0
Unrealized Losses | (70) | (36)
Fair value of financial assets | 8,264 |
Fair Value |  | 6,427
Cash |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 96,523 | 130,547
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 96,523 | 130,547
Money market funds |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 598 | 2,917
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair value of financial assets | $ 598 |
Fair Value |  | $ 2,917

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