|
Investments in Marketable Securities - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
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Jan. 31, 2014
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Jan. 31, 2013
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| Financial assets: |
|
|
| Cash and cash equivalents |
$ 112,271
|
$ 104,109
|
| Available for sale marketable securities: |
|
|
| Marketable securities, short-term |
5,555
|
6,050
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| Non-current marketable securities: |
|
|
| Marketable securities, long-term |
6,814
|
7,169
|
| Total |
128,103
|
119,940
|
| Other liabilities: |
|
|
| Acquisition-related consideration |
|
5,656
|
|
Money Market Accounts [Member]
|
|
|
| Financial assets: |
|
|
| Cash and cash equivalents |
3,463
|
2,612
|
|
U.S. Treasury Notes and Bonds Conventional [Member]
|
|
|
| Available for sale marketable securities: |
|
|
| Marketable securities, short-term |
3,545
|
2,016
|
| Non-current marketable securities: |
|
|
| Marketable securities, long-term |
|
2,071
|
|
U.S. Government Agency Issues Short Term [Member]
|
|
|
| Available for sale marketable securities: |
|
|
| Marketable securities, short-term |
2,010
|
4,034
|
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U.S. Government Agency Issues Long Term [Member]
|
|
|
| Non-current marketable securities: |
|
|
| Marketable securities, long-term |
6,814
|
5,098
|
|
Fair Value, Inputs, Level 1 [Member]
|
|
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| Financial assets: |
|
|
| Cash and cash equivalents |
112,271
|
104,109
|
| Non-current marketable securities: |
|
|
| Total |
119,279
|
110,808
|
| Other liabilities: |
|
|
| Acquisition-related consideration |
|
|
|
Fair Value, Inputs, Level 1 [Member] | Money Market Accounts [Member]
|
|
|
| Financial assets: |
|
|
| Cash and cash equivalents |
3,463
|
2,612
|
|
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury Notes and Bonds Conventional [Member]
|
|
|
| Available for sale marketable securities: |
|
|
| Marketable securities, short-term |
3,545
|
2,016
|
| Non-current marketable securities: |
|
|
| Marketable securities, long-term |
|
2,071
|
|
Fair Value, Inputs, Level 1 [Member] | U.S. Government Agency Issues Short Term [Member]
|
|
|
| Available for sale marketable securities: |
|
|
| Marketable securities, short-term |
|
|
|
Fair Value, Inputs, Level 1 [Member] | U.S. Government Agency Issues Long Term [Member]
|
|
|
| Non-current marketable securities: |
|
|
| Marketable securities, long-term |
|
|
|
Fair Value, Inputs, Level 2 [Member]
|
|
|
| Financial assets: |
|
|
| Cash and cash equivalents |
|
|
| Non-current marketable securities: |
|
|
| Total |
8,824
|
9,132
|
| Other liabilities: |
|
|
| Acquisition-related consideration |
|
|
|
Fair Value, Inputs, Level 2 [Member] | Money Market Accounts [Member]
|
|
|
| Financial assets: |
|
|
| Cash and cash equivalents |
|
|
|
Fair Value, Inputs, Level 2 [Member] | U.S. Government Agency Issues Short Term [Member]
|
|
|
| Available for sale marketable securities: |
|
|
| Marketable securities, short-term |
2,010
|
4,034
|
|
Fair Value, Inputs, Level 2 [Member] | U.S. Government Agency Issues Long Term [Member]
|
|
|
| Non-current marketable securities: |
|
|
| Marketable securities, long-term |
6,814
|
5,098
|
|
Fair Value, Inputs, Level 3 [Member]
|
|
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| Financial assets: |
|
|
| Cash and cash equivalents |
|
|
| Non-current marketable securities: |
|
|
| Total |
|
|
| Other liabilities: |
|
|
| Acquisition-related consideration |
|
5,656
|
|
Fair Value, Inputs, Level 3 [Member] | Money Market Accounts [Member]
|
|
|
| Financial assets: |
|
|
| Cash and cash equivalents |
|
|
|
Fair Value, Inputs, Level 3 [Member] | U.S. Government Agency Issues Short Term [Member]
|
|
|
| Available for sale marketable securities: |
|
|
| Marketable securities, short-term |
|
|
|
Fair Value, Inputs, Level 3 [Member] | U.S. Government Agency Issues Long Term [Member]
|
|
|
| Non-current marketable securities: |
|
|
| Marketable securities, long-term |
|
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