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Commitments and contingencies - Narrative (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
May. 29, 2014
$ / shares
Aug. 01, 2015
USD ($)
Apr. 30, 2016
shares
May. 28, 2014
lawsuit
Mar. 25, 2014
lawsuit
Loss Contingencies [Line Items]          
Common stock appraisal demanded and not withdrawn (shares) | shares     8.8    
Zale Corporation          
Loss Contingencies [Line Items]          
Pending claims | lawsuit       3 5
Zale Corporation          
Loss Contingencies [Line Items]          
Consideration received by acquiree shareholders (in dollars per share) | $ / shares $ 21.00        
Loss contingency accrual, provision   $ 34.2      
Loss contingency, accrual, current   $ 34.2