Annual report pursuant to Section 13 and 15(d)

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

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Fair Value Measurements - Schedule of Contractual Maturities Available-for-Sale Debt Securities (Detail)
$ in Thousands
Jan. 31, 2018
USD ($)
Fair Value Disclosures [Abstract]  
Maturity of one year or less $ 3,991
Maturity between one and five years 4,449
Total $ 8,440