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Related Party Transactions Related Party Transactions - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014
Related Party Transaction
Accounts receivable due from related party	$ 46,661us-gaap_DueFromRelatedParties	$ 95,789us-gaap_DueFromRelatedParties

- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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