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Discontinued operations Discontinued financials (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2016 | Jul. 31, 2015 | Jan. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Property, Plant and Equipment, Disposals |  |  | $ 7,100 |  |
Proceeds from Sale of Buildings |  |  | 1,900 |  |
Disposal Group, Including Discontinued Operation, Revenue | $ 3,276 | $ 14,914 | 10,467 | $ 32,311 |
Gain on disposal of discontinued operations | 1,605 | 0 | 2,472 | 0 |
Income (loss) from discontinued operations | 423 | (35) | (660) | (1,338) |
Income (loss) from discontinued operations before income tax | 2,028 | (35) | 1,812 | (1,338) |
Discontinued operation, income tax expense | 719 | 88 | 703 | 88 |
Income (loss) from discontinued operations, net of tax | 1,309 | $ (123) | 1,109 | (1,426) |
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents | 0 |  | 0 |  | $ 5
Disposal Group, Including Discontinued Operation, accounts receivable, net | 597 |  | 597 |  | 5,720
Disposal Group, Including Discontinued Operation, Inventory | 0 |  | 0 |  | 2,000
Disposal Group, Including Discontinued Operation, Other Assets | 212 |  | 212 |  | 1,552
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment | 1,739 |  | 1,739 |  | 6,456
Disposal Group, Including Discontinued Operation, Assets | 2,548 |  | 2,548 |  | 15,733
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities | 1,320 |  | 1,320 |  | 7,514
Disposal Group, current maturities | 0 |  | 0 |  | 5,322
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent | 0 |  | 0 |  | 2,629
Disposal Group, Including Discontinued Operation, Liabilities | $ 1,320 |  | 1,320 |  | $ 15,465
Cash (used in) provided by operating activities, discontinued operations |  |  | (208) | 224 |
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  |  | 7,574 | (1,295) |
Cash (used in) provided by financing activities, discontinued operations |  |  | $ (7,365) | $ 754 |

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- Definition Amount of cash inflow (outflow) of investing activities of discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760 + Details
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- Definition Amount, after allowance for bad debt, of other loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition The cash inflow from sale of buildings. + 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 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration