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Income taxes
 9 Months Ended
Nov. 02, 2019
Income Tax Disclosure [Abstract]  
Income taxes Income taxes
 
39 weeks ended
 
November 2, 2019
 
November 3, 2018
Estimated annual effective tax rate before discrete items(1)
13.6
 %
 
22.7
 %
Discrete items recognized
(9.3
)%
 
(0.2
)%
Effective tax rate recognized in statement of operations
4.3
 %
 
22.5
 %

(1) 
Fiscal 2019 effective tax rate computed based on actual tax rate for the 39 weeks ended November 3, 2018.
During the 39 weeks ended November 2, 2019, the Company’s effective tax rate was lower than the US federal income tax rate primarily due to the unfavorable impact of impairment of goodwill which was not deductible for tax purposes. The estimated annual effective tax rate excludes the effects of any discrete items that may be recognized in future periods.
As of November 2, 2019, there has been no material change in the amounts of unrecognized tax benefits, or the related accrued interest and penalties (where appropriate), in respect of uncertain tax positions identified and recorded as of February 2, 2019.