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Investments in Marketable Securities - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Jan. 31, 2014
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Jan. 31, 2013
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Jan. 31, 2012
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| Fair Value Disclosures [Abstract] | |||
| Marketable Securities, Current | $ 5,600,000 | $ 6,100,000 | |
| Marketable Securities, Noncurrent | 6,800,000 | 7,200,000 | |
| Other than temporary declines in investments | 0 | 0 | 0 |
| Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax | 12,000 | 6,000 | 100,000 |
| Cash equivalents and marketable securities | $ 128,100,000 | $ 120,900,000 | |
| X | ||||||||||
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- Definition
Aggregate cash, cash equivalents, short term investments and restricted cash. No definition available.
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| X | ||||||||||
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- Definition
The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period. 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
The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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