|
Income taxes (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
|
Oct. 31, 2014
|
Oct. 31, 2013
|
Oct. 31, 2014
|
Oct. 31, 2013
|
Jan. 31, 2014
|
|
| Income Tax Disclosure [Abstract] | |||||
| Income tax provision | $ 1,100 | $ 1,280 | $ 5,047 | $ 3,724 | |
| Effective tax rate | 26.50% | 39.30% | 36.50% | 38.50% | |
| Net impact of discrete tax items on effective tax rate | 12.10% | 3.10% | |||
| Unrecognized tax benefits | 229 | 229 | 256 | ||
| Net unrecognized tax benefits | 53 | 53 | 47 | ||
| Anticipated decrease in total gross unrecognized tax benefits within 12 months | $ 6 | $ 6 | |||
| X | ||||||||||
|
- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|