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Goodwill And Intangible Assets (Narrative) (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Jan. 31, 2012
|
Jan. 31, 2011
years
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Jan. 31, 2010
|
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| Goodwill And Intangible Assets [Line Items] | |||
| Goodwill | $ 97,281,000 | $ 70,426,000 | $ 17,019,000 |
| Capitalized intangible assets | 48,200,000 | 76,500,000 | 19,100,000 |
| Weighted average amortization period (in years) | 6 | 6 | 6 |
| Amortization expense | $ 35,400,000 | $ 26,300,000 | $ 22,200,000 |
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Capitalized Software And Development Costs [Member]
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| Goodwill And Intangible Assets [Line Items] | |||
| Weighted average amortization period (in years) | 6 | 5 | 6 |