Income taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Feb. 03, 2018 |
Jan. 28, 2017 |
|
| Reconciliation of unrecognized tax benefits, excluding interest and penalties | ||
| Balance at beginning of the period | $ 3,305 | $ 2,262 |
| Increase due to a prior year tax position | 1,064 | 1,048 |
| Decrease due to a prior period position | (804) | (5) |
| Balance at the end of the period | $ 3,565 | $ 3,305 |
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|