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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 18,854us-gaap_NetIncomeLoss $ 5,260us-gaap_NetIncomeLoss
Other comprehensive income (loss):    
Unrealized gains (losses) on investments (16)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss 8us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
Other comprehensive income (loss), net of tax (16)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 8us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income $ 18,838us-gaap_ComprehensiveIncomeNetOfTax $ 5,268us-gaap_ComprehensiveIncomeNetOfTax