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Cash, Cash Equivalents and Investments (Summary Of Cash, Cash Equivalents And Available-For-Sale Investments) (Details) - USD ($) $ in Thousands | Aug. 31, 2020 | Nov. 30, 2019
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Cash, Cash Equivalents and Investments [Line Items] |  |
Cash and cash equivalents | $ 220,575 | $ 154,259
Unrealized Gains | 131 | 23
Unrealized Losses | 0 | 0
Total Amortized Cost Basis | 229,988 | 173,662
Total Fair Value | 230,119 | 173,685
State and municipal bond obligations |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis |  | 7,036
Unrealized Gains |  | 1
Unrealized Losses |  | 0
Fair Value |  | 7,037
U.S. treasury bonds |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 4,994 | 7,221
Unrealized Gains | 75 | 10
Unrealized Losses | 0 | 0
Fair Value | 5,069 | 7,231
Corporate bonds |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 4,419 | 5,146
Unrealized Gains | 56 | 12
Unrealized Losses | 0 | 0
Fair Value | 4,475 | 5,158
Cash |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Cash and cash equivalents | 214,037 | 144,346
Money market funds |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Cash and cash equivalents | $ 6,538 | $ 9,913

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