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Intangible assets and goodwill (Schedule of finite-lived intangible assets) (Details) (USD $)
In Thousands, unless otherwise specified |
Oct. 31, 2014
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Jan. 31, 2014
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| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-lived intangible assets, gross | $ 38,168 | $ 33,204 |
| Intangible assets, net | (11,918) | (8,513) |
| Total | 26,250 | 24,691 |
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Capitalized software development costs
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| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-lived intangible assets, gross | 9,073 | 5,290 |
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Software
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| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-lived intangible assets, gross | 4,532 | 3,351 |
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Acquired intangible member assets
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| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-lived intangible assets, gross | $ 24,563 | $ 24,563 |