Annual report [Section 13 and 15(d), not S-K Item 405]

Debt (Details)

v3.26.1
Debt (Details)
£ in Thousands, $ in Thousands
12 Months Ended
Aug. 27, 2025
USD ($)
Jan. 31, 2026
GBP (£)
Jan. 31, 2026
USD ($)
Jan. 31, 2026
GBP (£)
Feb. 01, 2025
USD ($)
Notes payable          
Outstanding borrowings under credit facility     $ 62,287    
National Westminster Bank PLc | Revolving Credit Facility          
Notes payable          
Maximum borrowing capacity | £       £ 40,000  
Increase in revolving facility | £   £ 10,000      
Interest rate margin (as a percent)   1.75%      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   ulta:SterlingOvernightIndexAverageMember      
Unused line fee (as a percent)   0.60%      
Outstanding borrowings under credit facility     62,287    
National Westminster Bank PLc | Revolving Credit Facility | Minimum          
Notes payable          
Fixed charge coverage ratio covenant   4      
National Westminster Bank PLc | Revolving Credit Facility | Maximum          
Notes payable          
Fixed charge coverage ratio covenant   2      
Amendment No. 4 to the Second Amended and Restated Loan Agreement | Wells Fargo and JP Morgan Chase          
Notes payable          
Credit spread adjustment rate (as a percent) 0.10%        
Amendment No. 4 to the Second Amended and Restated Loan Agreement | Wells Fargo and JP Morgan Chase | Minimum          
Notes payable          
Fixed charge coverage ratio covenant 1        
Unused line fee (as a percent) 0.25%        
Amendment No. 4 to the Second Amended and Restated Loan Agreement | Wells Fargo and JP Morgan Chase | Maximum          
Notes payable          
Unused line fee (as a percent) 0.375%        
Amendment No. 4 to the Second Amended and Restated Loan Agreement | Wells Fargo and JP Morgan Chase | Base Rate | Minimum          
Notes payable          
Interest rate margin (as a percent) 0.50%        
Amendment No. 4 to the Second Amended and Restated Loan Agreement | Wells Fargo and JP Morgan Chase | Base Rate | Maximum          
Notes payable          
Interest rate margin (as a percent) 1.00%        
Amendment No. 4 to the Second Amended and Restated Loan Agreement | Wells Fargo and JP Morgan Chase | SOFR | Minimum          
Notes payable          
Interest rate margin (as a percent) 1.50%        
Amendment No. 4 to the Second Amended and Restated Loan Agreement | Wells Fargo and JP Morgan Chase | SOFR | Maximum          
Notes payable          
Interest rate margin (as a percent) 2.00%        
Amendment No. 4 to the Second Amended and Restated Loan Agreement | Wells Fargo and JP Morgan Chase | Revolving Credit Facility          
Notes payable          
Maximum borrowing capacity $ 1,000,000        
Outstanding borrowings under credit facility     $ 0   $ 0
Amendment No. 4 to the Second Amended and Restated Loan Agreement | Wells Fargo and JP Morgan Chase | Letters of credit          
Notes payable          
Maximum borrowing capacity $ 50,000