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Debt Instruments (Details) (USD $)
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12 Months Ended | |||
|---|---|---|---|---|
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Jan. 31, 2013
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Jan. 31, 2012
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Jan. 31, 2011
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May 13, 2011
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| Debt Instruments | ||||
| Outstanding amount | $ 828,000 | $ 520,000 | ||
| Cash collateral considered to be restricted cash | 828,000 | 520,000 | ||
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Credit facility
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| Debt Instruments | ||||
| Maximum borrowings available | 30,000,000 | |||
| Minimum liquidity requirement | 5,000,000 | |||
| Total debt issuance costs | 1,000,000 | |||
| Term of credit facility agreement | 4 years | |||
| Amount of debt issuance costs that were amortized and included in interest expense | 300,000 | 200,000 | 0 | |
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Credit facility | Debt outstanding greater than or equal to $15 million
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| Debt Instruments | ||||
| Outstanding balance | 15,000,000 | |||
| Non-usage charge (as a percent) | 0.50% | |||
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Credit facility | Debt outstanding less than $15 million
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| Debt Instruments | ||||
| Outstanding balance | 15,000,000 | |||
| Non-usage charge (as a percent) | 0.625% | |||
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Credit facility | LIBOR
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| Debt Instruments | ||||
| Variable interest rate base | LIBO | |||
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Credit facility | LIBOR | Debt outstanding greater than or equal to $15 million
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| Debt Instruments | ||||
| Margin (as a percent) | 3.00% | |||
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Credit facility | LIBOR | Debt outstanding less than $15 million
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| Debt Instruments | ||||
| Margin (as a percent) | 2.75% | |||
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Credit facility | Alternate base rate
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| Debt Instruments | ||||
| Variable interest rate base | alternate base rate | |||
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Credit facility | Alternate base rate | Debt outstanding greater than or equal to $15 million
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| Debt Instruments | ||||
| Margin (as a percent) | 2.00% | |||
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Credit facility | Alternate base rate | Debt outstanding less than $15 million
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| Debt Instruments | ||||
| Margin (as a percent) | 1.75% | |||
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Credit facility | Federal funds effective rate
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| Debt Instruments | ||||
| Variable interest rate base | federal funds | |||
| Margin (as a percent) | 0.50% | |||
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Credit facility | Adjusted LIBO rate
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| Debt Instruments | ||||
| Variable interest rate base | adjusted LIBO | |||
| Margin (as a percent) | 1.00% | |||
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Letters of credit
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| Debt Instruments | ||||
| Maximum borrowings available | 5,000,000 | |||
| Outstanding amount | 828,000 | 520,000 | ||
| Available borrowing capacity | 29,170,000 | 29,480,000 | ||
| Cash collateral considered to be restricted cash | $ 828,000 | $ 520,000 | ||
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Letters of credit | Debt outstanding greater than or equal to $15 million
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| Debt Instruments | ||||
| Annual charge on outstanding amount (as a percent) | 3.00% | |||
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Letters of credit | Debt outstanding less than $15 million
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| Debt Instruments | ||||
| Annual charge on outstanding amount (as a percent) | 2.75% | |||