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Selected Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2013 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2013 | Nov. 30, 2012 | Nov. 30, 2011
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 90,980 | $ 77,578 | $ 81,705 | $ 83,733 | $ 86,642 | $ 74,371 | $ 74,128 | $ 82,471 | $ 333,996 | $ 317,612 | $ 333,610
Gross profit | 82,885 | 69,059 | 73,216 | 73,854 | 76,980 | 64,883 | 65,518 | 73,917 | 299,014 | 281,298 | 296,833
Income from operations | 23,900 | 9,661 | 14,386 | 15,793 | 18,659 | 11,289 | 12,800 | 25,041 | 63,740 | 67,789 | 108,712
Income from continuing operations | 14,618 | 7,204 | 8,142 | 9,813 | 12,494 | 7,744 | 8,855 | 15,861 | 39,777 | 44,954 | 71,389
Net income (loss) | $ 15,036 | $ 24,843 | $ 3,910 | $ 31,118 | $ 36,025 | $ 5,838 | $ (1,908) | $ 7,489 | $ 74,907 | $ 47,444 | $ 59,629
Continuing operations (in dollars per share) | $ 0.28 | $ 0.13 | $ 0.15 | $ 0.17 | $ 0.20 | $ 0.12 | $ 0.14 | $ 0.26 | $ 0.73 | $ 0.71 | $ 1.09
Continuing operations (in dollars per share) | $ 0.28 | $ 0.13 | $ 0.15 | $ 0.17 | $ 0.20 | $ 0.12 | $ 0.14 | $ 0.25 | $ 0.72 | $ 0.71 | $ 1.06

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