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Subsequent events (Details) - Subsequent Event
$ in Millions
Feb. 26, 2019
USD ($)
store
employee
Subsequent Event [Line Items]  
Number of stores closed | store 22
Minimum  
Subsequent Event [Line Items]  
Charges associated with store closing $ 23.0
Maximum  
Subsequent Event [Line Items]  
Charges associated with store closing 25.0
Acceleration of Rent Expense  
Subsequent Event [Line Items]  
Charges associated with store closing 16.0
Write-offs of Other Assets | Minimum  
Subsequent Event [Line Items]  
Charges associated with store closing 5.0
Write-offs of Other Assets | Maximum  
Subsequent Event [Line Items]  
Charges associated with store closing 6.0
Employee Severance  
Subsequent Event [Line Items]  
Charges associated with store closing 0.5
Other Costs | Minimum  
Subsequent Event [Line Items]  
Charges associated with store closing 1.5
Other Costs | Maximum  
Subsequent Event [Line Items]  
Charges associated with store closing $ 2.5
Retail Store Employees  
Subsequent Event [Line Items]  
Number of positions eliminated | employee 185
Corporate Employees  
Subsequent Event [Line Items]  
Number of positions eliminated | employee 8