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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 | Feb. 29, 2016 | Nov. 30, 2015
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Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | $ 251,425 | $ 241,276
Unrealized Gains | 78 | 30
Unrealized Losses | (12) | (27)
Fair Value | 251,491 | 241,279
State and municipal bond obligations [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 38,217 | 20,387
Unrealized Gains | 78 | 30
Unrealized Losses | 0 | 0
Fair Value | 38,295 | 20,417
U.S. treasury bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 4,110 | 3,109
Unrealized Gains | 0 | 0
Unrealized Losses | (5) | (15)
Fair Value | 4,105 | 3,094
U.S. government agency bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 1,639 | 1,645
Unrealized Gains | 0 | 0
Unrealized Losses | (1) | (4)
Fair Value | 1,638 | 1,641
Corporate bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 3,755 | 3,756
Unrealized Gains | 0 | 0
Unrealized Losses | (6) | (8)
Fair Value | 3,749 | 3,748
Cash [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 196,422 | 186,241
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 196,422 | 186,241
Money market funds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 7,282 | 26,138
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | $ 7,282 | $ 26,138

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