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Reconciliation of Income Taxes At Federal Statutory Rate to Effective Rate (Detail)
3 Months Ended 12 Months Ended
Feb. 03, 2019
Feb. 02, 2020
Jan. 28, 2018
Reconciliation of Statutory Federal Tax Rate [Line Items]      
Federal income taxes at the statutory rate 21.00% 21.00% 33.90%
Re-measurement of deferred tax assets / liabilities (2.20%)   6.70%
Transition tax (0.60%)   2.90%
State income tax rate 3.80% 2.90% 2.50%
Officer's compensation under Sec.162(m)   1.00%  
Deferred true up   (1.30%)  
Change in uncertain tax positions 4.10% 0.50% (1.60%)
Rate differential (2.30%) (1.80%) (2.90%)
Research and development credits (2.10%) (0.70%)  
Other 0.60% 0.50% 1.10%
Effective tax rate 22.30% 22.10% 42.60%