Quarterly report pursuant to Section 13 or 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
Apr. 30, 2015
Fair Value Disclosures [Abstract]  
Maturity of one year or less $ 3,507us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Maturity between one and five years 8,783us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Total $ 12,290us-gaap_AvailableForSaleSecuritiesDebtSecurities