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Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified |
6 Months Ended | |||
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Jul. 31, 2012
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| Ending balance July 31, 2012 | $ 13,347 | [1] | ||
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Categories Of Investments Marketable Securities Trading Securities Member Level 1 [Member]
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| Ending balance January 31, 2012 | 11,995 | |||
| Purchases | 10,526 | |||
| Sales/Maturities | (9,174) | |||
| Ending balance July 31, 2012 | $ 13,347 | |||
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| X | ||||||||||
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- Definition
Debt securities issued by a United States government agency such as Government National Mortgage Association (Ginnie Mae), Federal Home Loan Mortgage Corporation (Freddie Mac), and Federal National Mortgage Association (Fannie Mae), which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. No definition available.
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| X | ||||||||||
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- Definition
The cash outflow from purchases of trading, available-for-sale securities and held-to-maturity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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