Quarterly report pursuant to Section 13 or 15(d)

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

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Fair Value Measurements - Schedule of Contractual Maturities Available-for-Sale Investments (Detail)
$ in Thousands
Apr. 30, 2017
USD ($)
Fair Value Disclosures [Abstract]  
Maturity of one year or less $ 7,245
Maturity between one and five years 2,989
Total $ 10,234