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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, 2017 | Nov. 30, 2016
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Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | $ 245,099 | $ 249,894
Unrealized Gains | 11 | 0
Unrealized Losses | (28) | (140)
Fair Value | 245,082 | 249,754
State and municipal bond obligations [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 37,195 | 32,831
Unrealized Gains | 11 | 0
Unrealized Losses | 0 | (107)
Fair value of financial assets | 37,206 |
Fair Value |  | 32,724
U.S. treasury bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 5,680 | 6,542
Unrealized Gains | 0 | 0
Unrealized Losses | (28) | (29)
Fair value of financial assets | 5,652 |
Fair Value |  | 6,513
Corporate bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 4,338 | 3,485
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | (4)
Fair value of financial assets | 4,338 |
Fair Value |  | 3,481
Cash [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 191,940 | 196,863
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 191,940 | 196,863
Money market funds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 5,946 | 10,173
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair value of financial assets | $ 5,946 |
Fair Value |  | $ 10,173

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