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Contractual Obligations (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013
Summary of contractual obligations
Purchase Commitments, 2018 and Thereafter
Purchase Commitments, 2017
Purchase Commitments, 2016
Purchase Commitments, 2015	1,247
Purchase Commitments, 2014	8,173
Purchase Commitments, Total	9,420
Operating Lease Obligations, 2018 and Thereafter
Operating Lease Obligations, 2017	104
Operating Lease Obligations, 2016	138
Operating Lease Obligations, 2015	273
Operating Lease Obligations, 2014	372
Operating Lease Obligations, Total	887
Contractual Obligation, 2018 and Thereafter
Contractual Obligation, 2017	104
Contractual Obligation, 2016	138
Contractual Obligation, 2015	1,520
Contractual Obligation, 2014	8,545
Contractual Obligation, Total	$ 10,307

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