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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, 2014 | Aug. 31, 2014 | May 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2014 | Nov. 30, 2013 | Nov. 30, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 97,894 us-gaap_SalesRevenueNet | $ 79,274 us-gaap_SalesRevenueNet | $ 80,827 us-gaap_SalesRevenueNet | $ 74,538 us-gaap_SalesRevenueNet | $ 90,980 us-gaap_SalesRevenueNet | $ 77,578 us-gaap_SalesRevenueNet | $ 81,705 us-gaap_SalesRevenueNet | $ 83,733 us-gaap_SalesRevenueNet | $ 332,533 us-gaap_SalesRevenueNet | $ 333,996 us-gaap_SalesRevenueNet | $ 317,612 us-gaap_SalesRevenueNet
Gross profit | 86,755 us-gaap_GrossProfit | 71,413 us-gaap_GrossProfit | 73,449 us-gaap_GrossProfit | 66,657 us-gaap_GrossProfit | 82,885 us-gaap_GrossProfit | 69,059 us-gaap_GrossProfit | 73,216 us-gaap_GrossProfit | 73,854 us-gaap_GrossProfit | 298,274 us-gaap_GrossProfit | 299,014 us-gaap_GrossProfit | 281,298 us-gaap_GrossProfit
Income from operations | 27,027 us-gaap_OperatingIncomeLoss | 19,431 us-gaap_OperatingIncomeLoss | 20,280 us-gaap_OperatingIncomeLoss | 14,002 us-gaap_OperatingIncomeLoss | 23,900 us-gaap_OperatingIncomeLoss | 9,661 us-gaap_OperatingIncomeLoss | 14,386 us-gaap_OperatingIncomeLoss | 15,793 us-gaap_OperatingIncomeLoss | 80,740 us-gaap_OperatingIncomeLoss | 63,740 us-gaap_OperatingIncomeLoss | 67,789 us-gaap_OperatingIncomeLoss
Income from continuing operations | 14,464 us-gaap_IncomeLossFromContinuingOperations | 11,095 us-gaap_IncomeLossFromContinuingOperations | 12,799 us-gaap_IncomeLossFromContinuingOperations | 11,100 us-gaap_IncomeLossFromContinuingOperations | 14,618 us-gaap_IncomeLossFromContinuingOperations | 7,204 us-gaap_IncomeLossFromContinuingOperations | 8,142 us-gaap_IncomeLossFromContinuingOperations | 9,813 us-gaap_IncomeLossFromContinuingOperations | 49,458 us-gaap_IncomeLossFromContinuingOperations | 39,777 us-gaap_IncomeLossFromContinuingOperations | 44,954 us-gaap_IncomeLossFromContinuingOperations
Net Income | $ 14,464 us-gaap_NetIncomeLoss | $ 11,095 us-gaap_NetIncomeLoss | $ 12,799 us-gaap_NetIncomeLoss | $ 11,100 us-gaap_NetIncomeLoss | $ 15,036 us-gaap_NetIncomeLoss | $ 24,843 us-gaap_NetIncomeLoss | $ 3,910 us-gaap_NetIncomeLoss | $ 31,118 us-gaap_NetIncomeLoss | $ 49,458 us-gaap_NetIncomeLoss | $ 74,907 us-gaap_NetIncomeLoss | $ 47,444 us-gaap_NetIncomeLoss
Basic earnings per share from continuing operations (in dollars per share) | $ 0.29 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.22 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.25 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.22 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.13 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.15 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.17 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.97 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.73 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.71 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted earnings per share from continuing operations (in dollars per share) | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.22 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.25 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.21 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.13 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.15 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.17 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.96 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.72 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.71 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare

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