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Stock-based compensation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2014 | Jan. 31, 2014
Option activity [Line Items] |  |
Granted | 97 |
Granted, Weighted Average Exercise Price | $ 12.41 |
Unrecognized compensation expense | $ 900,000 |
Unrecognized compensation expense recognized period | 2 years 6 months 40 days |
Restricted Stock [Member] |  |
Option activity [Line Items] |  |
Unrecognized compensation expense | 500,000 |
Unrecognized compensation expense recognized period | 2 years 0 months 0 days |
Stock Option [Member] |  |
Option activity [Line Items] |  |
Outstanding at beginning of year |  | 776
Weighted Average Exercise Price Per Share |  | $ 11.69
Weighted Average Remaining Contractual Term |  | 6 years 1 month 24 days
Options Outstanding Aggregate Intrinsic Value | 857,000 | 3,859,000
Granted | 97 |
Granted, Weighted Average Exercise Price | $ 12.41 |
Exercised | (45) |
Exercised Weighted Average Exercise Price Per Share | $ 7.27 |
Exercised Aggregate Intrinsic Value | 155,000 |
Expired or forfeited | (61) |
Expired or Forfeited Weighted Average Exercise Price Per Share | $ 19.35 |
Outstanding end of period | 767 |
Outstanding Weighted Average Exercise Price Per Share | $ 11.45 |
Outstanding Weighted Average Remaining Contractual Term | 6 years 0 months 0 days |
Exercisable end of period | 520 |
Exercisable Weighted Average Exercise Price Per Share | $ 12.09 |
Exercisable Weighted Average Remaining Contractual Term | 4 years 8 months 0 days |
Exercisable Aggregate Intrinsic Value | 676,000 |
unvested option [Member] |  |
Option activity [Line Items] |  |
Outstanding at beginning of year | 247 | 263
Weighted Average Exercise Price Per Share | $ 10.10 | $ 8.31
Options Outstanding Aggregate Intrinsic Value | $ 180,000 | $ 1,633,000
Vested | (102) |
Expired or forfeited | (11) |
Expired or Forfeited Weighted Average Exercise Price Per Share | $ 8.36 |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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