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Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Jan. 31, 2013 | Jan. 31, 2012
Accounts Receivable (Additional Textual) [Abstract] |  |
Amount outstanding collectible period | 12 months |
Allowance for doubtful accounts | $ 5.5 | $ 5.5
Account receivable from Solar Energy field project owner | 2.1 |
Grant for Advanced Payment for Project | 7.8 |
Maximum [Member] |  |
Accounts Receivable (Textual) [Abstract] |  |
Length of retention period of amount given to project owner | 3 years |
Minimum [Member] |  |
Accounts Receivable (Textual) [Abstract] |  |
Length of retention period of amount given to project owner | 9 months |
Construction Contracts Retainages [Member] |  |
Accounts Receivable (Textual) [Abstract] |  |
Contract payment amounts retained by project owners | $ 20.2 | $ 9.8

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- Details
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- Definition Accounts receivable from energy field project owner. + References No definition available. + Details
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Balance Type: | debit
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- Details
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- Definition Amount outstanding. + References No definition available. + Details
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- Definition Grant for advanced payment for project. + References No definition available. + Details
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- Definition The length of time retainage amounts are held by project owners prior to payment to contractor. + References No definition available. + Details
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Period Type: | instant

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- Definition Amount billed to customers under long-term contracts or programs 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 310 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6471494&loc=d3e49370-109356 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph c(1) -Article 5 + Details
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