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) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Fair Value Disclosures [Abstract]  
Maturity of one year or less $ 5,022
Maturity between one and five years 7,126
Total $ 12,148