Annual report pursuant to Section 13 and 15(d)

Investments in Marketable Securities - Schedule of Contractual Maturities Available-for-Sale Debt Securities (Detail)

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Investments in Marketable Securities - Schedule of Contractual Maturities Available-for-Sale Debt Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2014
Fair Value Disclosures [Abstract]  
Maturity of one year or less $ 5,555
Maturity between one and five years 6,814
Total $ 12,369