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Retention Retention payable (Details) (USD $) In Millions, unless otherwise specified | Jan. 31, 2013 | Jan. 31, 2012
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Retention Payable, Fiscal Year Maturity [Abstract] |  |
Retention payable | $ (0.5) | $ (0.4)

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- Definition Amounts owed to vendors and subcontractors that have been withheld because of retainage provisions in a contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 405 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6471548&loc=d3e50610-109371 + Details
Name: | us-gaap_RetentionPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_RetentionPayableAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration