Acquisition (Details) (USD $)	12 Months Ended
Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Acquisition [Abstract]
Payment for acquisition	$ 0	$ 25,000,000	$ 0
Goodwill, Acquired During Period		$ 24,493,000
Percentage Of Common Shares Owned In Venture	49.00%
Percentage Of Profits Or Losses Of Venture	75.00%

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Percentage of common shares owned in venture with Damas

+ References

No definition available.

+ Details

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- Definition

Percentage of entitled profits or losses of venture with Damas.

+ References

No definition available.

+ Details

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

+ Details

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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