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Cash, Cash Equivalents and Investments (Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Feb. 28, 2018	Nov. 30, 2017
Investments and Cash [Abstract]
Due in one year or less	$ 24,188	$ 22,333
Due after one year	26,198	27,812
Total	$ 50,386	$ 50,145

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- Definition

Fair value of debt securities

+ References

No definition available.

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- Definition

Fair value of debt securities maturities after one year.

+ References

No definition available.

+ Details

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- Definition

Fair value of debt securities maturities within one year.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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