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Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]      
Net income $ 50,571us-gaap_NetIncomeLoss $ 25,654us-gaap_NetIncomeLoss $ 18,188us-gaap_NetIncomeLoss
Other comprehensive income (loss):      
Unrealized gains (losses) on investments (1)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss    
Other comprehensive income (loss), net of tax (1)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent    
Comprehensive income $ 50,570us-gaap_ComprehensiveIncomeNetOfTax $ 25,654us-gaap_ComprehensiveIncomeNetOfTax $ 18,188us-gaap_ComprehensiveIncomeNetOfTax