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Discontinued operations (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2016 | Jan. 31, 2016
Discontinued operations |  |
Disposal Date |  | Jan. 29, 2016
Sale price of discontinued operations |  | $ 22.0
Net proceeds from divestiture of businesses |  | $ 18.4
escrow | $ 0.5 |
Property, Plant and Equipment, Disposals | 7.1 |
Proceeds from Sale of Buildings | 1.9 |
Other Property [Member] |  |
Discontinued operations |  |
Property, Plant and Equipment, Disposals | 0.5 |
Proceeds from Sale of Buildings | 0.4 |
Facility Closing [Member] |  |
Discontinued operations |  |
Property, Plant and Equipment, Disposals | 1.5 |
Proceeds from Sale of Buildings | $ 1.4 |

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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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