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Commitments and Contingencies (Details) (USD $)
|
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Oct. 31, 2012
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Oct. 31, 2011
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Oct. 31, 2012
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Oct. 31, 2011
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Nov. 20, 2012
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Nov. 16, 2012
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| Commitments and Contingencies | ||||||
| Rent expense | $ 900,000 | $ 800,000 | $ 2,600,000 | $ 1,800,000 | ||
| Operating lease obligations | ||||||
| Total | 45,585,000 | |||||
| Future minimum payments pertaining to an amendment | 30,600,000 | |||||
| Less Than 1 year | 3,325,000 | |||||
| 1-3 years | 13,442,000 | |||||
| 3-5 years | 14,977,000 | |||||
| More Than 5 years | 13,841,000 | |||||
| Future sublease rental income | $ 2,800,000 | |||||