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Commitments and contingencies - Narrative (Details)
shares in Thousands
3 Months Ended
Aug. 01, 2015
USD ($)
shares
Sep. 24, 2014
shares
Aug. 26, 2014
shares
Jun. 04, 2014
shares
May. 28, 2014
lawsuit
Mar. 25, 2014
lawsuit
Loss Contingencies [Line Items]            
Common stock, shares held by former stockholders (shares)   2,427 2,450 3,904    
Common stock appraisal demanded and not withdrawn (shares) 8,800          
Zale Corporation            
Loss Contingencies [Line Items]            
Pending claims | lawsuit         3 5
Zale Corporation            
Loss Contingencies [Line Items]            
Loss Contingency Accrual, Provision | $ $ 34,246,984          
Loss Contingency, Accrual, Current | $ $ 34,200,000