Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 4)

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Fair Value Measurements (Details 4) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2012
Jan. 31, 2012
Investment Maturities:    
Less than one year $ 3,081 $ 7,855
One to three years 10,266 4,140
Investment Maturities, Total $ 13,347 $ 11,995