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Composition of Certain Financial Statement Captions (Details) (USD $)
In Thousands, unless otherwise specified |
Apr. 30, 2013
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Jan. 31, 2013
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Apr. 30, 2012
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Jan. 31, 2012
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| Cash, Cash Equivalents and Short-term Investments | ||||
| Total cash and cash equivalents | $ 55,435 | $ 65,725 | $ 44,690 | $ 44,126 |
| Total short-term investments | 19,983 | 23,247 | ||
| Cash, cash equivalents and short-term investments | 75,418 | 88,972 | ||
| Unrealized gains or losses | 0 | 0 | ||
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Cash
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| Cash, Cash Equivalents and Short-term Investments | ||||
| Total cash and cash equivalents | 19,104 | 22,703 | ||
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Money market funds
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| Cash, Cash Equivalents and Short-term Investments | ||||
| Total cash and cash equivalents | 28,080 | 32,522 | ||
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Commercial paper
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| Cash, Cash Equivalents and Short-term Investments | ||||
| Total cash and cash equivalents | 7,500 | 10,500 | ||
| Total short-term investments | 14,345 | 13,592 | ||
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Corporate debt securities
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| Cash, Cash Equivalents and Short-term Investments | ||||
| Total cash and cash equivalents | 751 | |||
| Total short-term investments | $ 5,638 | $ 9,655 |
| X | ||||||||||
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- Definition
The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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