Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 1)

v2.4.0.6
Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Oct. 31, 2012
Ending balance October 31, 2012 $ 12,788 [1]
Categories Of Investments Marketable Securities Trading Securities Member Level 1 [Member]
 
Ending balance January 31, 2012 11,995
Purchases 12,101
Sales/Maturities (11,308)
Ending balance October 31, 2012 $ 12,788
[1] Money market funds and U.S. government agency securities, included in cash and cash equivalents in the accompanying balance sheet, are valued at quoted market prices for identical instruments in active markets.