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Deferred revenue (Details) - USD ($)
$ in Millions
Jul. 30, 2016
Apr. 30, 2016
Jan. 30, 2016
Aug. 01, 2015
May 02, 2015
Jan. 31, 2015
Deferred Revenue Arrangement [Line Items]            
Voucher promotions and other $ 17.9   $ 28.2 $ 13.5    
Total deferred revenue 894.4   889.4 837.2    
Current liabilities 254.5   260.3 230.2    
Non-current liabilities 639.9   629.1 607.0    
Sterling Jewelers            
Deferred Revenue Arrangement [Line Items]            
ESP deferred revenue 720.3 $ 723.8 715.1 691.4 $ 690.7 $ 668.9
Zale Jewelry            
Deferred Revenue Arrangement [Line Items]            
ESP deferred revenue $ 156.2   $ 146.1 $ 132.3