Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Schedule of Contractual Maturities Available-for-Sale Debt Securities (Detail)

v2.4.1.9
Fair Value Measurements - Schedule of Contractual Maturities Available-for-Sale Debt Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Fair Value Disclosures [Abstract]  
Maturity of one year or less $ 7,516us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Maturity between one and five years 6,793us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Total $ 14,309us-gaap_AvailableForSaleSecuritiesDebtSecurities